In the following questions, a part of the sentence is in bold. Below are given alternatives to the bold part at 1, 2 and 3 which may improve the sentence. Choose the correct alternative. In case no improvement is needed, your answer is (4).
I was shocked to learn that no one was knowing where the files were kept.

Options

A. was known
B. knew
C. had been known
D. No Improvement

Answer

B

Explanation

(2) Here, Past Simple-knew is the right usage.