Mary's parents are trying to decrease the number of times that she feeds the family dog during the day. Mary's parents set a criterion level for the maximum number of times that she can feed the dog in a day, and if Mary achieves this level she gets a story read to her at bedtime. Which type of differential reinforcement are Mary's parents using?
a. DRO
b. DRA
c. DRL
d. DRC

option C:  DRL

Explanation:

Differential Reinforcement can be defined simply as putting into use a  reinforcing, only when  the  right or appropriate  behavior that an individual want to increase thereby  using elimination to responses of any other.

Differential Reinforcement of Lesser Rates of Behavior (DRL) – is a type of differential reinforcement that deals with the reinforcement usually quite some time  where  the behavior shown by a the child exhibits the behavior at a predetermined small rate of occurrence. this method seeks to  Reduce Behaviors  not needed urgently or quickly using Differential Reinforcement of Low Rates of Behavior. it is a method of intervention strategy in the sense that a reinforcer is only  given when the behavior or response to a particular behavior did occurs at a small or low  rate than  it was before, thereby decreasing or reducing the rate of occurrence of the negative or inappropriate behavior or response.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.