Select the most appropriate option that can substitute the highlighted words in the given sentence.
When the boat was upset, we could swim to the bank.

Correct option is A

The correct substitution of the highlighted words is (a) were able to.
Explanation: The phrase “could” indicates ability in general, but when talking about specific successful actions in the past, we use “was/were able to”.
Grammatical rule used:
�� Use “was/were able to” for a specific past action successfully done, instead of "could."
Example: I was able to finish the exam in time.
�� Information Booster: Use "could" for general ability, but “was/were able to” when emphasizing a completed achievement.