Help with this sentence...

[elemat]

The Commerce Department announced that the economy grew during the second quarter at a 7.5 percent annual rate, while inflation eased when it might have been expected for it to rise.
a)
b)it might have been expected to rise
c)it might have been expected that is should rise
d) its rise might have been expected
e) there might have been an expectation it would rise

All these choices sound awkward to me, can anyone explain which should be the correct answer and why the other choices are wrong?

[smackmartine]

Answer should be option B

Its an Idiom correction.

Correct Idiom is "expected to"

a) 2 "it" are redundant, second "it" is unnecessary and doesn't have an antecedent(noun).

b) CORRECT

c) passive statement is used (most of the times considered WRONG in GMAT), which degrades the importance of "inflation" + idiom is not complete

d) wrong idiom used

e) awkward,lengthy statement
+ "expectation" is not parallel to "grew"