Step 1: Understand the task → We need to identify which part of the sentence (1–4) contains the grammatical error when they are combined into one meaningful statement.
Step 2: Inspect (1) “He made me to wait” → This phrase is incorrect. In English, the verb “make” in the causative sense is followed by a bare infinitive (verb without “to”). Therefore, the correct form should be: “He made me wait.” The insertion of “to” is a grammatical mistake.
Step 3: Inspect (2) “for him, while he” → This fragment is fine. It shows the reason for waiting and introduces a dependent clause “while he ….” No error here.
Step 4: Inspect (3) “changed his coat,” → This is grammatically correct and logically consistent. It explains what the subject did while the other person was waiting. No issue here.
Step 5: Inspect (4) “as it was cold.” → This is also correct. It gives the reason why he changed his coat. The grammar and usage are fine.
Step 6: Rebuild the corrected sentence → Putting it all together correctly, the sentence should be: “He made me wait for him, while he changed his coat, as it was cold.” Notice that the error in (1) has been fixed by removing “to.”
Step 7: Conclusion → The erroneous part is 1, because “made me to wait” is grammatically incorrect; it must be “made me wait.”
FinalAnswer:The correct option is (A): 1 is incorrect.