Select the most appropriate option to improve the underlined segment in the given sentence. If there is no need to improve it, select No improvement.
A little carefulness can have averted the accident

Options

A. can averted
B. could have averted
C. could have avert
D. No improvement

Answer

B

Explanation

Use could have averted. in place of .can have averted.. The sentence is in past and the event happened in past time so the correct sentence will be: A little carefulness could have averted the accident.