Circulation of Ideal gas

Classical Mechanics Level 3

The above diagram shows circulation of an ideal gas by the sequence A $\to$ B $\to$ C $\to$ A. The temperature of the ideal gas at point A is $15$ °C, and the temperature from B to C remains constant at T.

Which of the following is correct?

a) T= $45$ °C.
b) V $_2$ = $3$ V $_1$ .
c) The process A $\to$ B is related to Boyle's law.