In the following question, the sentence given with blank to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.
There is now a reasonably ______ body of evidence suggesting that, even from the most rigorous scientific perspective, unselfishness and concern for others are not only in our own interests but also, in a sense, innate to our biological nature.

Options

A. substantial
B. small
C. insignificant
D. ethereal

Answer

A, B