which is the icon for a linear trend line?

which is the icon for a linear trend line?
Answer
Brief Explanations:
A linear trend - line is a straight line that represents the general direction of a set of data points. Among the given options, the first graph shows a straight line fitting the data points, while the others show curved lines which represent non - linear trends.
Answer:
The first graph (the one with a straight line among the data points)