Q676402 - FUMARC - 2018 - Cemig-MG - Engenheiro de Sistemas Mecânicos JR,

The use of the modal verb may in “which may explain the big rise in bar staff" (paragraph 6) indicates that

a) It is mandatory to explain the big rise in bar staff.
b) It is necessary to explain the big rise in bar staff.
c) It is permitted to explain the big rise in bar staff.
d) It is possible to explain the big rise in bar staff.