Identify the segment that contains a grammatical error.
I told him I must go,/ but he took no notice,/ so I thought the better thing I could do was to slip off.

Option (d) contains an error.
Explanation:
1. The phrase "the better thing I could do" is incorrect as it uses the comparative adjective "better" instead of the superlative "best."
2. Comparative adjectives like "better" are used when comparing two options, but here the sentence refers to the most appropriate action.
3. The correct term is "the best thing I could do," indicating the optimal choice.
Hindi Explanation: "Better thing" की जगह "best thing" का उपयोग करें क्योंकि यह सर्वोत्तम विकल्प को दर्शाता है। Corrected sentence: I told him I must go, but he took no notice, so I thought the best thing I could do was to slip off.