Correct option is B
The correct substitution of the highlighted words is (b)
taller.
Explanation: The phrase “more taller” is grammatically incorrect because
“taller” is already a comparative adjective, and we should not use “more” before it.
Grammatical rule used: Comparative adjectives of one syllable form by adding “-er” (e.g., taller, smarter), not by adding "more".
Example: He is taller than his brother. (✅)
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Information Booster: Use "more" only with adjectives of two or more syllables that do not end with “-er”, like “more beautiful”, “more expensive”.