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The verb "forbade" (past tense of "forbid") is typically followed by an object and an infinitive verb (to + base verb). The correct structure is "forbid + object + to-infinitive".

Why other options are incorrect

I forbade him from going: While "from" + gerund (going) is used after verbs like "prevent", "prohibit", and "refrain" (e.g., I prevented him from going), it is not the standard or most grammatically correct construction with "forbid" in formal English.
I forbade him going: This structure is not grammatically correct with the verb "forbid".
I forbade him not to go: "Forbid" already has a negative meaning (to order not to do something), so using "not to go" creates a redundant double negative (unless a specific emphasis is intended, which is rare and not the standard form). The "forbade him to go" already means that the action of "going" was not allowed

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