Adiscriminative stimulus is:
1) a stimulus in the presence of which a response will be reinforced
2) a stimulus in the presence of which a response will not be reinforced
3) a stimulus in the presence of which a response will be placed on extinction
4) a stimulus that cues respondent behavior to occur

The correct answer is option 1. a stimulus in the presence of which a response will be reinforced

Explanation:

We call discriminative stimuli to those stimuli that indicate the probability that a given response is reinforced. The presence of a discriminative stimulus makes the appearance of the responses that have been reinforced in their presence more likely.

It's a neutral stimulus that indicates when the response may or may not lead to the desired consequence. That is, the discriminative stimulus indicates whether the enhancer is available.

it is a better alternative

the answer is : the nut cases won't quit battling and their recurrence of flights will going to continue as before despite the fact that the battles are less hazardous now because of their bills have all of a sudden been blunted.   in the falcon dove diversion, two creatures will drive towards one another to crush one another, among the two one will win and other will swerve. in this way, clearly, the battle will be dependably there between two creatures for the assets or mate.