The bedplate must be rigid enough to support the weight of the rest of the engine, and mai

The bedplate must be rigid enough to support the weight of the rest of the engine, and maintain the crankshaft, which sits in the bearing housings in the ______, in alignment.

A.longitudinal girders

B.transverse girders

C.fore girders

D.aft girders

请帮忙给出正确答案和分析，谢谢！