A researcher wants to investigate the relationship between pressure and temperature in carbon dioxide gas (CO2) by using a pressure sensor on an airtight flask. image

In Step 1 of the investigation, the student adds CO2 to the flask at 20℃.

Choice Steps Taken Expected Result Graph
A.
Step 2: Turn on the hot plate to increase the temperature of the gas and record the resulting pressure.

Step 3: Repeat with different sizes of flasks to account for volume.

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B.
Step 2: Keep the volume of the flask constant.

Step 3: Turn on the hot plate to increase the temperature of the gas and record the resulting pressure.

image
C.
Step 2: Turn on the hot plate to increase the temperature of the gas and record the resulting pressure.

Step 3: Repeat with different sizes of flasks to account for volume.

image
D.
Step 2: Keep the volume of the flask constant.

Step 3: Turn on the hot plate to increase the temperature of the gas and record the resulting pressure.

image

Which steps should the student take next and what would be the expected results?

A.
Choice C

B.
Choice B

C.
Choice A

D.
Choice D

PLEASE GIVE ME THE CORRECT ANSWER. THANK YOU IN ADVANCE!!