When can a proposed legislation (bills) be defeated by opponents?
a. when the bill is being considered by the subcommittee
b. when the bill is being voted on by the full committee
c. when the bill reaches the floor
d. all of the above

d. all of the above

Explanation:

Opponents can defeat a proposed legislation in the subcomitee, when is being voted by the full comitee and when the bill reaches the floor, it all dependes on the political strength that oppositon has, there are times when opposition can do anything to defeat a bill cause the sole numbers of one party allows them to pass a bill without having to convince factions of the other party, but this is rarely the case.

#1 im pretty sure its a.