While Having a Discussion About Valves, Technician a Says That

While having a discussion about valves, Technician A says that higher compression is possible with the L-head. Technician B says that higher compression is achieved with the I-head because, unlike the L-head, the combustion chamber does not need extra volume to accommodate the valves. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B