Is the sentence simple, compound, or complex?

jeremiah gave his cousin guitar lessons for two months.

a. simple

b. complex

c. compound

Plz i'm really bad with these and it would really mean a lot if you could ?

Read the summary of the first three paragraphs of “the world on turtle’s back.”[1] in the beginning, there was no land, only the great ocean. [2] the sky-world, the home of the gods, was above the ocean. [3] a sacred tree stood at the center. [4] one of the gods pulled out some of its roots for his pregnant wife. [5] this created a hole in the floor of the sky-world. [6] the man's wife fell through the hole toward the ocean below, clutching the roots in her hand.which is the best way to combine sentences 4 and 5? a) one of the gods pulled out some of its roots for his pregnant wife, which created a hole in the floor of the sky-world.b) one of the gods pulled out some of its roots for his pregnant wife, he created a hole in the floor of the sky-world.c) one of the gods pulled out some of its roots for his pregnant wife which created a hole in the floor of the sky-world.d) one of the gods pulled out some of its roots for his pregnant wife he created a hole in the floor of the sky-world.

Why would a letter from the author support his argument better than an essay? o a. it can be less threatening to a reader and more personal. o b. it can let the author give lots of factual data to support his argument. o c. it can give the author a chance to make mistakes. o d. it can allow the audience to read it many times.