Dear patricia I have an essay assignment about reusing plastic garbage. Would you like to go together to the library to look up for resources? The assignment is

Dear patricia
I have an essay assignment about reusing plastic garbage. Would you like to go together to the library to look up for resources? The assignment is due by the end of this week. Can we go there after school? Please, reply soon. I do need your help.
Cindy

What is the purpose of the text?
A. Finishing essay assignment about reusing plastic garbage
B. Asking Patricia to accompany Cindy to the library.
C. Inviting Cindy to go to the library with Patricia
D. Submitting the essay assignment together.