Pick up the incorrect statement from the following for allowing workers to enter sewers_______________?

A. Warning signals should be erected

B. The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes

C. Proper tests for the presence of poisonous gases must be carried out

D. The men entering the manhole should be advised to smoke in the sewer

Found an error? Read our corrections policy and submit a sourced correction below. You can also share a useful explanation in your own words.

Discuss the answer or suggest a sourced correction
Thank you for contributing.
Your comment was submitted and will appear after editorial review.

Your email is used only for moderation and is never displayed. Spam, copied material and fabricated endorsements are rejected.