==> 답변 (Practical English Usage -- Oxford에서 나온책)의 prefer부분 설명입니다.

1. When we say that we prefer one activity to another, two -ing forms can be used.

(e.g: I prefer riding to walking.)

2. The second can be introduced by to or rather than (more formal)

(e.g: I prefer riding rather than walking.)

3. Prefer can also be followed by an infinitive(to 부정사를 말하는 거에요)

   -- this is normal after " would prefer" // The structure can be continued by

 "rather than" with an infinitive or an -ing form.

(e.g: I would prefer to spend the weekend at home rather than (to) drive/driving

       all the way to your mother's)

--> 3번을 보심, 결국 둘다 된다는 말이네요 ^^*

prefer가 좀 복잡해서 시험에 자주 나오지용. prefer A rather than B로 외우시공..

B에는 to 부정사나 동명사 둘다 가능하다고 알아두심 될거 같아요~