Children often have difficulty remembering the letters in the middle of the alphabet because of

the serial position effect

Explanation:

Experiments show that when participants are presented with a list of words, they tend to remember the first few and last few words and are more likely to forget those in the middle of the list.

This is known as the serial position effect. The tendency to recall earlier words is called the primacy effect; the tendency to recall the later words is called the recency effect.

"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 would be b, a tariffs main purpose is to protect domestic production and jobs.