To prevent your children from swimming in their pool when you are not home, you don't allow them to stay home alone when you are not there. if you send them to the neighbor's house instead, you are using

the first settlements began along the huang river because of the importance of the huang river in the beginning of china. it goes back to the story, “the tale of emperor yu”, which references the tale of the great flood, which was caused by the huang river and was believed to create and influence china’s making.

the correct answer is a