She is more prettier than her sister.
She is more prettier than her sister.
A: She is prettier than her sister.
B: She has most prettier than her sister.
C: She had prettier than her sister.
D: None of these
She is prettier than her sister avoids redundant more with the comparative prettier. This question tests grammar rules in English exams. Correct comparative forms ensure clear comparisons. The sentence is concise and grammatically accurate.