The conclusion: If we reduce production budgets so that operas can be supported exclusively by box-office receipts and donations from individuals, then the public will be able to see less famous operas.

The evidence: The high cost of productions is severely limiting which operas are available to the public. These costs necessitate reliance on large corporate sponsors, who in return demand that only the most famous operas be produced.

Key assumption: Without corporate sponsors, operas can produce less-famous operas.

To weaken the conclusion, we'll go right after the assumption. If opera companies cannot afford to produce less-famous operas without corporate sponsors, then budget reductions will not lead to people seeing these less-famous operas. The opera companies will stick to the famous stuff. This weakens the conclusion.

Choice E was asked about. This says that the money taken in at the box-office and through individual donations can't match the corporate sponsorship money. But that's not what's relevant. If the box-office/donation income was 89% of corporate dollars, would that be enough? Could less-famous operas then be produced profitably? We can't answer this question from the evidence, so we can't say that this would weaken (or strengthen) the conclusion. Maybe less-famous operas could still be produced.

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I'm available if you'd like any follow up.