Correct option is A
The correct substitution for the highlighted segment is "overflowed its banks."
Explanation: The word "overflew" is incorrect in this context. The correct verb is "overflowed," which means that the river's water rose and spread beyond its banks. Additionally, "it’s" is a contraction for "it is" or "it has," which is incorrect here. The correct form is "its," which is the possessive pronoun.
Correct Sentence: The river overflowed its banks in the monsoon.
Grammatical Rule Used: "Overflowed" is the past tense of "overflow," and "its" is the correct possessive form used to show ownership.
Example: The dam overflowed its limits after the heavy rains.