Answer:
(a) options 1 and 4
(b) option 1 only 
Explanation:
Concept to learn:
REFER TO PICTURE ABOVE: 
- means negative 
+ means positive
(a) 9/-8 can be viewed as +/- = -. Hence any fraction that yields a overall negative value is the answer. 
(b) - 5/-9 can be views as - /- = +. Hence, any fraction that yields a positive value is the answer.