To a Degree, the Navigation Laws Were Beneficial to Colonists

To a degree, the Navigation Laws were beneficial to colonists because  

A) colonists were paid subsidies for producing ships' parts and stores.
B) tobacco growers were guaranteed a monopoly of the British market for their crop.
C) colonial trading ships were protected by the Royal Navy.
D) colonists did not have to deal with British intermediaries when marketing their goods.
E) they helped create a surplus of money.