Concept:
The slope of a line passing through two points
\[
(x_1,y_1)
\]
and
\[
(x_2,y_2)
\]
is
\[
m=\frac{y_2-y_1}{x_2-x_1}
\]
Step 1: Check Statement I.
The line passes through
\[
(0,0)
\]
and
\[
(3,2)
\]
So the slope is
\[
m=\frac{2-0}{3-0}
\]
\[
m=\frac{2}{3}
\]
Thus Statement I alone is sufficient.
Step 2: Check Statement II.
Statement II says the line passes through only one point:
\[
(3,3)
\]
Infinitely many lines can pass through a single point, and they can have different slopes.
Therefore, Statement II alone is not sufficient.
Step 3: Final answer.
\[
\boxed{\text{Statement I alone is sufficient}}
\]