Correct option is C
Explanation:
The phrase "to be through" is grammatically incorrect and does not make sense in this context. The intended meaning is that the person should read/review the safety tips carefully.
The correct infinitive form here is “to go through”, which means “to examine, read, or study carefully.”
"You are requested to go through the safety tips..." is a grammatically and semantically correct construction.
Example Sentence:
You are advised to go through all instructions before operating the machine.
Grammar Rule:
Infinitive + Base Verb Structure:
After verbs like "requested", we use “to + base verb”.
Correct: You are requested to submit the form.
Incorrect: You are requested to submitted the form.