Answer:
Variable-ratio
Step-by-step explanation:
A variable-ratio reinforcement schedule occurs when a behavior is reinforced based on a random number of displays. Thus, unlike fixed schedules, asking for dating partners do not always elicit a positive reward - which is why it is categorized as variable; the response can be positive or negative. It is also not an interval-based reinforcement schedule, since it is not based on time period. Variable-ratio schedules fit this behavior since asking someone out can get you a positive response once you tried hard enough or with enough people - but when it would happen, you cannot predict.