The vapor pressure of a liquid in a closed container depends
on which of these:
(a) the volume above the liquid,
(b) the amount of liquid present,
(c) temperature?

(c) temperature

Explanation:

In a closed system, as the temperature increases, the molecules in the liquid are exited and converts into gas. The more the gas transformed, the more the gas(vapor) pressure. The less the gas transformed, the less the vapor pressure.

Therefore, temperature is a major factor in vapor pressure.

1. they vary with a higher number because boiling is way hotter than melting

answer; talc and gypsum;