Understanding the Options:

• A. Adaptive radiation due to similar group of organisms inhabiting different environments
  Adaptive radiation occurs when a single ancestral species diversifies into multiple forms adapted to different environments. The forelimbs of mammals, including humans and whales, have diversified to suit different lifestyles (manipulation, swimming), making this statement correct.

• B. Divergent evolution due to similar group of organisms inhabiting different environments
  Divergent evolution refers to related species evolving different traits from a common ancestor as they adapt to different environments. The transformation of forelimbs into arms and flippers is a textbook example, so this statement is correct.

• C. Similar group of organisms with mutations and variations getting naturally selected in different environments
  Natural selection acts on mutations and variations within a population, favoring traits that improve survival in specific environments. This process drives the divergence of homologous structures. Hence, this statement is correct.

• D. Convergent evolution due to similar group of organisms inhabiting different environments
  Convergent evolution involves unrelated organisms independently evolving similar traits due to similar environmental pressures, resulting in analogous structures, not homologous ones. Since human forelimbs and whale flippers share common ancestry, this is incorrect.

What Does This Mean?

The forelimb and flipper example illustrates:

• Adaptive radiation: One ancestral lineage diversifying into forms adapted to different niches.

• Divergent evolution: Related species evolving distinct traits from a shared ancestor.

• Natural selection: Favoring beneficial variations in different environments.

Correct Combination:

(1) A, B and C

Additional Insights from Scientific Studies:

• The forelimbs of humans, whales, bats, and other mammals share the same basic bone structure (humerus, radius, ulna), despite their functional differences, supporting the concept of homology and common ancestry.

• Fossil evidence, such as from lobe-finned fish, further supports the evolutionary link between these structures.

• Homologous structures are evidence of divergent evolution, contrasting with analogous structures, which arise from convergent evolution.

Conclusion

The study of homologous structures like the human forelimb and whale flipper reveals evolutionary processes of adaptive radiation, divergent evolution, and the role of natural selection in shaping species to their environments. It does not support convergent evolution in this context.

Final Answer:
(1) A, B and C