In a cross compound steam engine ......

A

one high and one low pressure cylinder are set side by side, driving the same shaft, cranks being set $$90^\circ$$ apart

B

two cylinders are centred on the same piston rod, the 1.p. cylinder being placed nearest the crankshaft

C

two cylinders are set at $$90^\circ$$, usually to save floor space

D

None of these