Final answer:
The correct apothecary measurement comparison is C. 1 fl oz = 8 fl dr. The other options are in the customary system or metric conversions.
Step-by-step explanation:
The accurate comparison of an apothecary measurement and its equivalent within the apothecary system is C. 1 fl oz = 8 fl dr. The other options provided are examples of conversions within the customary system of measurements, rather than the apothecary system. The following are the correct conversions for the options provided: Option A should read "1 tsp = 60 gtt" (which is the apothecary system), and option E should read "1 c = 8 fl oz" within the customary system. Options B and D are also in the customary system, with B being "1 pt = 2 c" and D being "1 L = 1000 mL", which is actually a metric conversion.