In the given sentence, identify the segment which contains a grammatical error.
Please refrain to going out without a face mask.

Correct option is C

Option (c) contains an error.
Explanation: The verb "refrain" is always followed by the preposition "from" and a gerund (verb+ing). The structure "refrain to going" is incorrect. The correct usage is "refrain from going."
Correct sentence: Please refrain from going out without a face mask.
Grammatical rule used: Some verbs, such as "refrain", require specific prepositions followed by gerunds.
Example: She refrained from commenting during the meeting.
Information Booster:
"Refrain" never takes the infinitive "to + verb"; it always uses "from + verb-ing". This is a fixed prepositional verb pattern.