What tactic did Filipino insurgents use to undermine American power

Aself-rule
Bconcentration camps
Cguerilla warfare
Dinsurgency

Verified Answer :

One of the tactics that Filipino insurgents used to undermine American power was "guerrilla warfare" mostly due to the fact that the Filipinos knew the land and territory far better than the Americans.

C. Guerilla Warfare

I got a 100% on the test