Answer:
d.an unfavorable change in the efficiency of using fixed assets to generate sales.
Step-by-step explanation:
Since as we can see in the given situation that there is the reduction in the fixed asset turnover ratio i.e. it is reduced from 3 to 2.2 this means that there is a change i.e. unfavorable or non-favorable with respect to the efficiency of applying the fixed asset in order to producing or generating the sales
Therefore the option d is correct