An oil company wants to create lube oil, gasoline, and diesel fuel at two refineries. There are two sources of crude oil $($Crude A and Crude B$).$ The following chart depicts the problem with the costs located on the arcs.

What is the constraint for node $1($Crude A$)?$

$-x13-x14=-100$

$1513+1314=100$

$0\mathrm{.}813+0\mathrm{.}8514-100$

$913+1124=150$

None of the above