Choose the correct alternative which will improve the part of the sentence given in quotes.
The pedestrians 'should to be' cautious while crossing the road.

Options

A. must not
B. should be
C. should not
D. No Improvement

Answer

B

Explanation

For advice or suggestion, should is used. Subject + should + `V_1`
Subject + should be + Adjective
Hence, should be is the right usage.