Helium gas goes through a cycle ABCDA (consisting of two isochoric and two isobaric lines) as shown in figure. Efficiency of this cycle is nearly : (Assume the gas to be close to ideal gas ) <br>

Question

( A ) $12.5 \%$
( B ) $15.4 \%$
( C ) $10.5 \%$
( D ) $9.1 \%$