Question

The box was so heavy that the boy _______lift it.

a) cannot b) could not c) won't d) would not .​

Answer 1

b) could not

It is correct option for the question.

The word WAS in the question indicates Past Tense for which the other options do not match correctly.

Hope it helps you .

Namaste .

Answer 2

Answer:

d)would not

Explanation:

because past continuous tense