Select the most appropriate option to substitute the highlighted segment in the given sentence. If there is no need to substitute it, select 'no substitution required'.
He looks as trouble that I offered to help.

Correct option is D

The correct substitution of the highlighted words is (d) so troubled that.
Explanation:
The expression so...that is used to show result or consequence. The adjective should be in proper form; here “troubled” is correct (past participle form used as adjective).
Hence, the correct sentence is: He looks so troubled that I offered to help.
Grammatical rule used:
Structure: so + adjective/adverb + that + result clause
Example: She was so tired that she fell asleep immediately.
Information booster:
“As...as” is used for comparison, not result.
“So...that” always expresses cause and effect.