Answer:
The 1st one
Explanation:
Linear relates to a graph that depicts a straight line when the values are plugged in and plotted. Here the only graph with a straight line is graph a.
Graph A- Linear ✅
Graph B- A quadratic functions graph( the shape of a parabola or like the letter U)
Graph C- A quadratic functions graph( the shape of a parabola or like the letter U)
Graph D- A square root function's graph.