Which linear graph represents a proportional relationship?
a) A graph of a straight line that passes through the points negative 1 comma 3 and 0 comma 0.
b) A graph of a straight line that passes through the points negative 4 comma negative 3 and 0 comma negative 2.
c) A graph of a straight line that passes through the points negative 1 comma 3 and 0 comma 3.
d) A graph of a straight line that passes through the points negative 2 comma negative 1 and negative 2 comma 0.