The computer company's present troubles are a result of technological stagnation, marketing missteps, and managerial blunders so that several attempts to revise corporate strategies have failed to correct it.
A. so that several attempts to revise corporate strategies have failed to correct it.
B. so that several attempts at revising corporate strategies have failed to correct
C. in that several attempts at revising corporate strategies have failed to correct them
D. that several attempts to revise corporate strategies have failed to correct
E. that several attempts at revising corporate strategies have failed to correct them



A, C , E are wrong because they are using wrong reffernt......

"them" can refer to either strategies or attempts
"it" can't refer to the plural
now we have either B or D

Now an "attempt to" is correct form of idiom

We can also eliminate B C E based on this IDIOM usage also...

So answer must be D.

Any doubts?