Answer:
B.y increases as x increases.
Step-by-step explanation:
We are given that a graph.
We have to find the relationship between x and y.
From given graph, we can see that
The line is passing through the origin.
It means when x=0 then y=0
Direct proportional: It states that

It means when x increases then y also increases.
When x decreases then y also decreases.
Inversely proportional:It states that

When x increase then, the value of y will decreases.
When x decreases then, the values of y will increase.
We can see that from given graph, when x increases then, the values of y is also increases.
When x decreases then, the value of y also decreases.
Therefore, x is directly proportional to y.
Hence, option B is true.