Select the most appropriate option that can substitute the highlighted segment in the given sentence. If there is no need to substitute it, select ‘No substitution’.
My dear friends, we does not use it in mopping, cloth washing and bathing.

Correct option is B

The correct substitution of the highlighted words is (b) do not use it in mopping, cloth washing and bathing.
Explanation: The subject “we” is a plural subject, so it must take the plural helping verb “do”, not “does.” Therefore, “we does not” is grammatically incorrect and must be replaced with “we do not.” Also, the parallel structure in the list is maintained better with mopping, cloth washing, and bathing (all -ing forms showing activities).
Grammatical rule used:
· Subject–Verb Agreement: We/They/I + do not; He/She/It + does not.
· Parallelism: Items in a series should have a consistent grammatical form.
· Example: We do not waste water unnecessarily.
· Information booster / exception: In present simple negative sentences, the main verb stays in base form after do/does + not (e.g., does not use, do not use), and the choice of do/does depends strictly on the subject.