You should take care . . . . . . . . the little ones, else they may fall . . . . . . . . the well.

A. on, into

B. of, into

C. in, into

D. into, in

Answer: Option B

Solution(By Examveda Team)

If you take care of a person or animal, you provide for their needs. First blank will take 'of' as preposition.
When someone or something comes from outside to the inside, we use the word 'into'. Second blank will take 'into' as preposition.