This is a hard one and I can see why you decided to post it here. B is most definitely wrong but the other three are all neck and neck. There are both even pros and cons of A and C but I think it would be more reasonable to adopt a general routine. So I think the answer would be C.
No less than 2kg (4.4 pounds), 1kg (2 pounds 3.2 ounces) used in women’s events.
Actually, Lisa skates better than he
Actually, <em>he </em>skates better than Lisa
Because in elliptical clauses words are purposely left out because of pattern or logic of the sentence.
(Im not 100% sure ive just started learning it but it seems logical sorry if im not helpful)
Explanation:
our planes can protect the air force by shoot down the enemy planes
There should be a semicolon in between bill and the