Statement: The Central Bureau of Investigation receives the complaint of an officer taking bribe to do the duty he is supposed to.
Courses of Action:
1. CBI should try to catch the officer red-handed and then take a strict action against him.
2. CBI should wait for some more complaints about the officer to be sure about the matter.
Answer: A
Clearly, one complaint is enough for a wrong doing. This should be confirmed by catching the guilty red-handed and then strict action taken against him. So, only course I follows.