During the Second Phase (1776-78)of the American Revolution,British Military Efforts

During the second phase (1776-78) of the American Revolution,British military efforts were hampered by

A) a series of tactical blunders and misfortunes.
B) a severe shortage of new soldiers coming from England.
C) an American blockade of British ships.
D) the American capture of the commanding British general.
E) American alliances with Native American tribes in the region.