Answer:
A) $450.
Explanation:
The computation of the total deductible amount of the expenses is as follows:
In the case of the deduction with respect to the meal cost and entertainment. Only the half of the expense would be deducted i.e. for the business meeting
As in the question the opera tickets is $900 so the half of $900 i.e. $450 would be allowed as a deduction
Therefore the correct option is A.