1.答案：B.
2.
1）ban sb from doing sth 禁止某人做某事,无ban sb to do sth
2）forbid sb to do sth = forbid sb from doing sth = forbid one's/sb doing sth 禁止某人做某事
3）protect sb from sth 保护某人使其不受某物的伤害/影响,不符合句意.
4）prohibit sb from doing sth 禁止某人做某事,但是无prohibit sb to do sth.