An increase in the fixed asset turnover ratio from $2\mathrm{.}0$ to $2\mathrm{.}7$ indicates

a$.$ a favorable trend in the efficiency of using fixed assets to generate sales.

b$.$ a favorable trend in the efficiency of using fixed assets to pay down debt.

c$.$ an unfavorable trend in the efficiency of using fixed assets to generate sales.

d$.$ None of these choices are correct.