Why do the rules drop outbound connections to ports 135, 139, and 445?

Why do the rules drop outbound connections to ports 135, 139, and 445? (Pick your letter answer 

from the choices below)  (Give an example/Explain)

A. They are primarily used by malware to send spam. 

B. They are primarily used by malware to propagate. 

C. They are primarily used by malware to launch DoS attacks. 

D. They are primarily used by malware to detect themselves being analyzed.