Answer:
The correct answer would be option A.
Explanation:
Homologous structures can be defined as organs or anatomical skeleton of living organisms, that look different in different animals but are similar in anatomical structures, which displays that the animals share a common ancestor. Homologous structures generally have structures that are similar in their structure but the function is different.
The forelimbs of shrew and monkeys appear to look different but similar internal structure as homologous organs.
Thus, the correct answer would be option A.