在gg上搜到SC JJ- being那道,but no answer as well

1, The choice of M(sb) for the position of N(company) is based mostly on his being more of a manager than the other competitors(or applicants).

A, mostly on his being more of a manager than the other competitors(or applicants).
B. from that he is more of a manager than other…
C. mostly on his being more of manager than on other…
D. on more that …… than on ….
E. more on that he being ……than

who can confirm it with A or B???