Which of the following describes the function of dynein?

A) It is a protein involved in importing cargo into the nucleus through the nuclear pore complex.
B) It is a motor protein that moves along microtubules towards the nucleus.
C) It is a motor protein that moves along microtubules towards the cell periphery.
D) It is a cell structure used to pass virus particles directly between host cells.
E) It a cellular membrane protein used as a cell receptor by many viruses.