Last month

[akhpad]

Source: Veritas Prep SC-1

65 Last month, thousands of customers decided to switch to prepaid cellular phones so as to avoid the monthly charges imposed under most cellular phone contracts.

A so as to avoid
B and so could avoid
C to be in the avoidance of
D so that they could avoid
E in order that they would avoid

I can say that "so as to" is correct because "customers" is subject of the both the verbs "decided and avoid".

What do you think?
The confusion is in A and D.

[diebeatsthegmat]

Source: Veritas Prep SC-1

65 Last month, thousands of customers decided to switch to prepaid cellular phones so as to avoid the monthly charges imposed under most cellular phone contracts.

A so as to avoid
B and so could avoid
C to be in the avoidance of
D so that they could avoid
E in order that they would avoid

I can say that "so as to" is correct because "customers" is subject of the both the verbs "decided and avoid".

What do you think?
The confusion is in A and D.

so that is more precise than " so as to"

[mundasingh123]

Source: Veritas Prep SC-1

65 Last month, thousands of customers decided to switch to prepaid cellular phones so as to avoid the monthly charges imposed under most cellular phone contracts.

A so as to avoid
B and so could avoid
C to be in the avoidance of
D so that they could avoid
E in order that they would avoid

I can say that "so as to" is correct because "customers" is subject of the both the verbs "decided and avoid".

What do you think?
The confusion is in A and D.

so that is more precise than " so as to"

I think we should find better reason to eliminate D,
Both have the same nmbr of letters though