Answer:
c. music subscription service fee
Step-by-step explanation:
A discretionary expense is an expense you (or your family) can life without if it is required. A fixed expense is a period-specif expense, which means is and expense you paid over a fix time.
If you think about, the definition of "fixed, discretionary expense" fits an entertainment subscription perfectly; therefore a music subscription service fee is a fixed, discretionary expense.
