I. submarines and mines were an inexpensive and better way to engage battleships ii. convoys proved to be the most effective defense against submarines iii. the british navy dominated the world's oceans through its use of submarine warfare iv. great sea battles between surface ships were rare during the war which statements are true about warfare at sea in world war i?

a. iii and iv

b. i, ii, and iv

c. i, ii, and iii

d. i and iii only