Answer:
Boyle's law:
It can be expressed as:

where
and
are the initial pressure and initial volume values, and
and
are the values of Pressure and volume after changes.
As per the statement:
here,
,
,
,
To find the A:
using above formula we have;

⇒

Divide both sides by 3 we have;
A = 1.0 L
Similarly, find B:
,

Then;

⇒

Divide both sides by 6 we get;
⇒

or
B = 0.50 atm
To Find C:
,

then;

⇒

Divide both sides by 5 we get;
⇒

or
C= 0.60 atm
To Find D:
,

then;

⇒

Divide both sides by 0.75 we have;
D= 4.0 L
Therefore, the values are:
A = 1.0 L
B = 0.50 atm
C = 0.60 atm
D = 4.0 L