Assuming a constant temperature which sample below would you expect to be at the highest pressure?

Boyle’s law

The relationship between the volume and pressure of a given amount of gas at constant temperature was  published by the  Robert Boyle over 300 years ago. It is added in the statement now known as Boyle’s law: The volume of a given amount of gas held at constant temperature is inversely proportional to the pressure under which it is measured.So in this case temperature remain constant while pressure increased.

the correct answer is:

a. formation of precipitation