They refer to what?

[hadi98]

in this question is it save to asume that "they " in B refer to the building? Why?
logically it OK but in GMAT world is it OK?


New buildings in earthquake-prone areas must be heavily reinforced or else they may otherwise collapse in a strong quake.

A).
B)or they may collapse in a strong quake
C)so as not to collapse in a strong quake
D)not to collapse in a strong quake
E)or else it may collapse in a strong quake

[anilmanu]

"they" is a plural pronoun and refers to thje buildings.
whats the answer?
I'll go with B

[hadi98]

why it is not refer to earthquake-prone areas ?

[abhi426]

I would go for C