Identify the correct sentence from the options given below.

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**Solution:**

1. Option (a) is incorrect because the subject "scientist" is singular, but the verb "were" is plural. It should be "was finally able".

2. Option (b) is wrong since "Neither" is singular and should be followed by "has" instead of "have".

3. Option (c) is incorrect because the conditional sentence is wrongly formed. The correct form is "If the company had invested... it could have attracted...".

4. Option (d) is correct as it uses proper grammar, subject-verb agreement, and tense. The sentence clearly states that despite heavy rainfall, the workers continued their work and completed the project on time.

5. Option (e) is incorrect because option (d) is correct.

**Answer:** Option (d)

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