Is there no pronoun ambiguity in this?

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Is there no pronoun ambiguity in this?

by narisipalli » Mon Apr 26, 2010 11:22 pm
New buildings in earthquake-prone areas must be heavily reinforced or else they may otherwise collapse in a strong quake.

A. or else they may otherwise collapse in a strong quake
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

Answer:B

I felt that they could be refering to both buildings and earthquake-prone areas. Why is answer choice C wrong?
Source: — Sentence Correction |

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by beat_gmat_09 » Mon Apr 26, 2010 11:27 pm
narisipalli wrote:New buildings in earthquake-prone areas must be heavily reinforced or else they may otherwise collapse in a strong quake.

A. or else they may otherwise collapse in a strong quake
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

Answer:B

I felt that they could be refering to both buildings and earthquake-prone areas. Why is answer choice C wrong?
so as to is not idiomatic .. hence C is wrong

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