What is the purpose of the xargs command?

What is the purpose of the xargs command?

A.
It will read standard input and execute command lines with the read input.

B.
It will get user input from the graphical environment.

C.
It will clean up command line arguments and verify syntactic correctness.

D.
It will pass arguments on the command line to a new graphical application.

E.
It will allow users to specify long options for commands that normally only accept short options.