Choose the most suitable option to replace the bold part of the sentence: I suggested that he goes to the veterinary surgeon immediately as his dog was not well.

The correct option is (c) After verbs like suggest, recommend, insist, demand, English commonly uses the mandative subjunctive in that-clauses. In this structure, we use the base form of the verb (V1) for all subjects, not the third-person singular form.  Therefore, suggested that he goes is incorrect. It should be suggested that he go . Option (c) correctly uses go and keeps the meaning complete: I suggested that he go to the veterinary surgeon immediately...  Grammatical rule used: Suggest/Recommend/Insist + that + subject + base verb (subjunctive) OR should + base verb is also possible. Example (rule): The doctor suggested that she take rest. (Not: takes) Why other options are incorrect: Option A is missing the article the before veterinary surgeon and sounds incomplete in standard exam grammar. Option B is incorrect because after should we use the base verb, not goes . Option D changes the meaning to a past regret/action completed earlier, which does not match the context of giving advice/suggestion at that time. So the correct answer is (c)