The Green Ensemble, a nonprofit theater group, has always been financially dependent on contributions from corporations and would have been forced to disband this year if any of its corporate sponsors had withdrawn their financial support.
Information
Conditional (if) Any corporate sponsor Ensemble would have withdrew support this yr → had to disband
Pivot (but) The Ensemble continued to operate all year and has announced next year's schedule (i.e. didn't disband)
Evaluate
On Must Be True, the first thing to read for is conditionals, and we get one here in the first sentence.
When we see conditionals, they want to test our ability to contrapose them, to chain them up with other rules, or to see when a fact triggers the rule (usually via contrapositive).
When a fact triggers the contrapositive, they usually introduce it with a Pivot, because the fact is clashing with the right side of the conditional.
The contrapositive of the rule was don't disband → no corp sponsor withdrew
The last sentence tells us the group didn't disband.
Goal
So we know that none of its corporate sponsors withdrew. Let's look for that idea in the answers.