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Dear student,

$A t o B p r o c e s s i s i s o c h o r i c a n d w o r k d o n e i n i s o c h o r i c p r o c e s s i s z e r o . q = U = n C_{v} △ T = 1 \times \frac{3 R}{2} \times 300 = 450 R S O, q_{A B} = 450 R A t o C p r o c e s s i s i s o b a r i c i n n a t u r e . q = - n C_{p} ∆ T = - 1 \times \frac{5 R}{2} \times 150 = - 375 R S O, q_{C A} = - 375 R$

Hence, the correct option is (C).

Regards

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