When 5ml of HCl was added to the flask, 5 ml of air was
removed. This was done so
that.

A. there was still 140 ml of volume available for the
reaction

B. there was less than atmospheric pressure inside
the flask

C. there was more than atmospheric pressure inside
the flask to drive the reaction

A. There was still 140 ml of volume available for the reaction

Explanation:

According to Avogadro's law, we have that equal volumes of all gases  contains equal number of molecules

According to the ideal gas law, we have;

The pressure exerted by a gas, P = n·R·T/V

Where;

n = The number of moles

T = The temperature of the gas

R = The universal gas constant

V = The volume of the gas

Therefore, given that the volumes and number of moles of the removed air and added HCl are the same, the pressure and therefore, the volume available for the reaction will remain the same

There will still be the same volume available for the reaction.

i think the answer is terrae but not 100 percent sure. ▓▬▬ §