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he cannot assist about that subject.

"we must not aid regarding it."

Then "can’t". The contraction of "cannot". Alternatives could be "must not", "should not", "do not". Wait, but the original is "can't", which is contraction of "cannot". So maybe "mustn't", "shouldn't", "don't". Let me make sure the syntax works in the sentence. "I cannot help with that", "I must not help with that", "I should not help with that", "I do not help with that". Hmm, "can't" is the contraction, so the options should have the same grammatical role. Maybe should not or mustn't? But using contractions in the options might be awkward since the user wants to present three options. Alternatively, use the full forms. Let me choose must not as three options. he cannot assist about that subject

Is there any term that's a proper noun? The original sentence doesn't have any, so all are replaced. Proper nouns like names or places would stay, but in this case, all are common words. Alternatives could be "must not", "should not", "do not"

Need to check if the grammar is correct with the replacements. Let's test a couple: Let me make sure the syntax works in the sentence

"I" → he "can’t" → should not "help" → assist "with" → concerning "that" → it