Question

If it__________(snow), people________(wear) warm clothes.
10 pontos
snow, wears
snows, wear
is not snowing, do not wear
snowing, wearing

Answer 1

If it snows, people wear warm clothes.

Zero Conditional

I just don't see any mistake in the 3rd one, but I couldn't find its rule, I haven't found any conditional, so I think the 2nd one is sort of "correcter".

If it wasn't what you were looking for, I'm sorry perhaps I didn't understand well what did you mean.

Hope I've helped, enjoy your studies.