Sentence improvement — remove the illogical double cause ('reason' + 'because') and use a clean complement: 'The reason why he wrote the letter was that he could not contact him over the phone.'
Verbal Ability
Sentence Improvement
Difficulty: Easy
Choose an option
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Awhy he wrote the letter was since
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Bfor which he wrote the letter because
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Cwhy he wrote the letter was that
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DNo improvement
Answer
Correct Answer: why he wrote the letter was that
Explanation
Given sentenceThe reason why he wrote the letter was because he could not contact him over the phone.
Concept/ApproachAvoid double causatives like 'reason … because'. Standard English uses: 'The reason … was that …' or simply 'He wrote the letter because …'.
Option analysis• why he wrote the letter was that → correct complementizer 'that' after 'was' avoids redundancy.• 'why … was since' → 'since' is causal but sounds clumsy in this slot.• 'for which … because' → repeats cause ('for which' + 'because'); ungrammatical.• 'No improvement' → retains the redundancy.
Final Answerwhy he wrote the letter was that