Answer :

Final answer:

The correct answer is 'couldn't'.

Explanation:

The correct answer is d. couldn't. This option indicates that the student was unable to complete the task. The verb 'couldn't' is the past tense of 'cannot' and is used to express inability or lack of possibility. It is the most appropriate choice in this context.

Learn more about The meaning of 'couldn't' here:

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Thanks for taking the time to read Unfortunately I able to complete the task a didn t b hadn t c wasn t d couldn t. We hope the insights shared have been valuable and enhanced your understanding of the topic. Don�t hesitate to browse our website for more informative and engaging content!

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