Answer:
A. Heidi submitted her request after Fay
Step-by-step explanation:
Bonnie before Chac
Doug after Chad and Bonnie
Eileen before Chad and Doug
Fay before Eileen
Greg after Bonnie
Heidi after Greg
if Eileen's request was completed before Greg's:
lets call Fay's request A, Heidi's request B, Eileen's request C and Doug's request D
A before C
C before D
B after D
therefore, B after A and C