Verbal Ability - Sentence Improvement - Discussion

Discussion Forum : Sentence Improvement - Section 1 (Q.No. 56)
Directions to Solve

In questions given below, a part of the sentence is italicised and underlined. Below are given alternatives to the italicised part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, option 'D' is the answer.

Why the dinosaurs died out is not known.
it is not known
the reason is not known
that is not known
No improvement
Answer: Option
No answer description is available. Let's discuss.
3 comments Page 1 of 1.

Kimi said:   7 years ago
Why option B is not an answer?

Vikas said:   7 years ago
Why not B?

Kekin said:   1 decade ago
please let me know how following sentence can be left without improvement

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