Answer:
B. Data set X is not linear, and data set Y is linear.
Explanation:
We assume here that "form a pattern" means "roughly forms a line"... because a pattern doesn't necessarily equal a line, it would be a curve that would easily be interpreted too, but it wouldn't be linear.
Since you cannot form a pattern, and based on your choices for answer, we have have to say that data set X is NOT linear.
On the opposite, since the data set Y produces a pattern, it has to be linear.
So, X = NOT linear, Y = linear.