The length of one day on earth is determined by how long it takes

1) the moon to revolve once
2) the moon to rotate once
3) earth to rotate once
4) earth to revolve once

i need the answer fast

The answer is the Earth to rotate once, so choice 3.

Answer(12) judaism; ans(11) all of the above; //ans(10) islands that are artificially created; //ans(9) people accept that the caste system keeps order in society and prevent chaos; ///ans(8),brahman; ans(7) the sikhns; ///ans(6); the non-cooperation movement; asn(5)sporadically grant congressional requests; /ans(4) all of the above; ///ans(3) true; //ans(2) true; //ans(1) false;

Why you put last one a? i think is b.