The Following Are Three Novel Fentalog Compounds: an Analyst

The following are three novel fentalog compounds: An analyst uses HRMS to characterize these compounds. What information can be derived from exact mass data?

A) enough to differentiate these structures
B) enough to differentiate one structure from the other two
C) enough to determine which form is the most toxic
D) enough to determine which form is the least toxic
E) more than one of the above
F) none of the above