Select the correct passive form of the given sentence.A child could understand his theory. (a) His theory is being understood by a child. (b) His theory was understood by a child. (c) His theory could be understood by a child (d) His theory can be understood by a child

Options

A. His theory is being understood by a child.
B. His theory was understood by a child.
C. His theory could be understood by a child
D. His theory can be understood by a child

Explanation

(c) His theory could be understood by a child. (Correct) (a) His theory is being understood by a child. (Tense has changed) (b) His theory was understood by a child. (Tense has changed) (d) His theory can be understood by a child. (Tense has changed)