In the question below, a part is highlighted in bold, which may not be grammatically correct. Choose the correct alternative for the highlighted part to make the sentence grammatically correct.

The manager instructed the staff to took care of all client requests promptly and efficiently.

Correct option is A

Sentence given:
The manager instructed the staff to took care of all client requests promptly and efficiently.
Step 1: Spot the error
· After verbs like instructed, told, asked, advised, we use to + base form (infinitive).
· Here, to took is wrong because took is past tense.
· Correct form: to take.
Step 2: Check options
(a) to take care of all
· Correct grammar: “instructed … to take care of all.”
· Fits perfectly.
(b) for taking care of all
· Wrong structure. Would change the intended meaning.
(c) to taking care of all
· Incorrect, because “to” is part of the infinitive, not a preposition here. Should be “to take,” not “to taking.”
(d) to takes care of all
· Wrong, because “takes” is third-person singular. Subject is the staff (plural collective).
(e) No improvement required
· Incorrect, since “to took” is grammatically wrong.
Step 3: Corrected sentence
The manager instructed the staff to take care of all client requests promptly and efficiently.
Correct Answer: (a) to take care of all