Correct option is C
The correct improvement for the highlighted part of the sentence
"The watchman prevent him from parking his car near the gate." is
"prevented him from parking."
· This correction uses the past tense "prevented" to match the implied past action and maintains the correct preposition "from" for describing prevention of an action.
· Prevented him from parking" correctly describes the action taken by the watchman in a past context.
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Other options:
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(a) "prevents him for parking" and
(b) "prevented him to park" use incorrect prepositions.
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(d) "No improvement" would leave the original grammatical errors uncorrected.