The complete question is:
If a liquid is sealed in a container and kept at constant temperature, how does its vapor pressure change
a. it continues to steadily increase
b. it increases at first, then remains constant
c. it increaees at first, then decreases
d. it continues to steadily decrease
I believe the correct answer is option B. The vapor pressure change would be that it increases at first, then remains constant. More particles escape the liquid and go into the vapor phase at first. But eventually, the number of escaping particles equals the number of particles going back into the liquid.
