Jake is trying to teach his dog peach how to roll over. he first gives peach a treat whenever peach sits. next, he no longer rewards peach for sitting but rather gives peach a treat when the dog actually lies down. finally, jake rewards peach only when the dog rolls over. jake is using to train peach to roll over.

"social stratification refers to the way people are ranked and ordered in society. in western societies, stratification is primarily seen and understood as a result of socioeconomic status, which produces a hierarchy in which access to resources, and possession of them, increases from the lower to the upper strata"

answer to ur question is college b