How can the development of aptitudes be encouraged?
a. positive reinforcement
c. negative reinforcement
b. tangible rewards
d. isolation from negative influences

The correct answer is A) positive reinforcement.

The development of attitudes can be encouraged by positive reinforcement.

Positive reinforcement is the introduction of a desirable stimulus after an appropriate behavior. That pleasant or desirable stimulus is going to reinforce that behavior. This way, the behavior has the probability to occur again. So, when a person needs to develop an attitude or an ability, positive reinforcement is going to help the individual to do so. We can congratulate the effort, give accolades, or even a gift. This positive enforcement will be repeated many more times until it became a habit.  

the answer might be either a or c. can't be too sure , because i searched the web, but no valid answers came through.