I’m so confused idk what to do with this

A) 16 mm     B) 44 mm     C) 73 mm     D) 100 mm

A) 1.6 cm     B) 4.4 cm      C) 7.3 cm     D) 10 cm

E) 3/8 in     F) 1 1/2 in     G) 2 5/8 in     H) 3 3/4 in

OR

E) 0.375 in     F) 1.5 in     G) 2.625 in     H) 3.75 in

Easy. Piece of cake :•)

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.