Which of these was a reason the american colonies were fighting a war for independence in 1776?

The best option from the list would be "restrictions on colonial trade", although the much larger issue was that the colonies did not have representation in Parliament. 

Delaware, pennsylvania, new jersey, georgia, connecticut, massachusetts bay, maryland, south carolina, new hampshire, virginia, new york, north carolina, and rhode island and providence plantations where the 13 original colonies