What convinced congress to build a navy

Because congress received information that a British naval fleet was on its way and they needed some way to combate it. So the Continental Navy was formally organized, and on December 22, Esek Hopkins was appointed the first commander in chief of the Continental Navy. Congress also named four captains to the new service: Dudley Saltonstall, Abraham Whipple, Nicholas Biddle and John Burroughs Hopkins.

Explanation:

the section of the chart that represents a point at which a bill needs approval from a majority of people in both chambers to advance is j, as this is the only section before the bill becomes law which has both rows (symbolizing the chambers) converging into one, meaning that the two parts of the congress have to approve of it before it can march on with the process.