Г) There are
так как children множественное число
а there are используется когда кто-то (что-то) где-то находится
<span>1.children's
2. girl's
3.Mary and Sue's
5.uncle's
6.people's</span>
lf it is hot, snow (melts).
lf it is hot, snow (will melt);
If you (heat) water, it (boils).
If you (heat) water, it (will boil).
If you (heated) the water, it (would boil).
If you (had heated) the water, it (would have boiled).