<h2>
Answer:</h2>
Option: A is the correct answer.
A. it is a one-to-one function
<h2>
Step-by-step explanation:</h2>
Function--
A graph is one-one when a vertical line is drawn parallel to the y-axis and passing through the domain should intersect the curve exactly once.
i.e. it passes a vertical line test.
One-one function-
A function is said to be one-one if corresponding to each x we get a distinct y-value.
i.e. No two x have the same y-value.
Also it can be seen from the graph when any horizontal line is drawn parallel to the x-axis then the line intersect the curve atmost once.
i.e. it passes the horizontal line test.
Many-to-one function--
A function is many to one when many x-values are mapped to same y-value.
Clearly from the graph we see that the graph is a one-to-one function.
( As it passes the horizontal line test)
