A data member holds a 1 or 0 depending on whether taxes have been paid. The best identifier for this member is _____

The best identifier for this member is C. taxesArePaid.

The other options are not as good because they are not as descriptive. For example, option A, taxes, is too general. It could refer to any kind of taxes, not just taxes that have been paid. Option B, paidTaxes, is a bit better, but it is still not as descriptive as option C. Option D, code, is not a good identifier at all. It does not describe what the data member represents.

Option C, taxesArePaid, is the best identifier because it is the most descriptive. It clearly states that the data member represents whether taxes have been paid.