Military-political considerations frequently cast special operations into clandestine or covert environments; therefore, their activities normally involve oversight at the level. a. joint task forceb. national c. operationald. tactical

B. national  

Explanation:

Few military as well as political operations which are done in covert environment or secretly done involves the top profile personnel of the armed forces and the few government officials. So if any operations  are oversighted, it involves at the national level. All the activities or operations involve in a covert mission are done at the national level.

Hence the correct option is (B).

. austria-hungary began seizing british colonies in africa.