Correct Answer: Option B

Explanation

Since the temperature of the air is to remain constant, => P\(_1\)V\(_1\) = P\(_2\)V\(_2\)
∴ 75 x 30 = (75 + 15) x V\(_2\)
75 x 30 = 90 x V\(_2\)

V\(_2\) = \(\frac{75 \times 30}{90}\)

\(\frac{2250}{90}\) = 25cm\(^2\)

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