Which of the Following Is the Anatomical Basis of the Longitudinal

Which of the following is the anatomical basis of the longitudinal palmar arch?

A) The adjustable positions of the first,fourth,and fifth metacarpals around the fixed second and third metacarpals,and the musculature of the flexor digitorum profundus (FDP) and flexor digitorum superficialis (FDS)
B) The fact that the third metacarpal is the longest bone in the hand
C) The relatively mobile unit formed by the second and third metacarpal as they articulate with the trapezium and trapezoid,and the musculature of the FDP and FDS
D) The carpal arch