petroleum it to industry______blood is to man.a thatb as ifc whatd which

petroleum it to industry______blood is to man.
a that
b as if
c what
d which

C
根据句式:A be to B what C be to D.

D

C
题目有些问题

c

petroleum is to industry what blood is to a man.
石 油 之 于 工 业 犹 如 血 液 之 于 人 。