Which sentence uses 'than' correctly in a comparison?

• A. She is taller then her sister.
• B. She is taller than her sister.
• C. She is taller then than her sister.
• D. She is taller than his sister.

Answer: (B)

In a comparison, the connecting word should link the two things being compared. When talking about height, you use than to show the difference, as in “taller than.” “Then” is for sequence in time, not for comparisons, so inserting it breaks the meaning. Also, using his sister changes the subject’s gender to male, which doesn’t fit the sentence starting with “She.” Therefore, the sentence that uses “taller than” to compare her height to her sister’s is the natural, correct choice.