Answer:
I would say that this passage is built mainly examples. So A.
Explanation:
In english, the general formula is verb + ed.
ex. visit -> visited
If someone has their head down or they’re sad, you tell them to keep their chin up so that their crown doesn’t slip. Telling them that they should stay happy or they’re worth it
a. three major supporting details.
There are three supporting details for the main idea on the theories to explain why people yawn. Each of the supporting details contains a key word or phrase to indicate that they indeed are a main supporting detail. These key words and phrases are "One explanation is...", "A second theory...", and "Yet another explanation...". These all show the supporting detail is contained in the sentence. The last sentences just build and connect to information that has already been introduced.
