Given that the equation is as follows:
Where h is the height of the plant and d denotes the number of days.
Remember that the term "function" refers to a statement, rule, or law that describes a connection between one variable (the independent variable) and another variable (the dependent variable).
Next, substitute d = 1 in equation (1) as follows:
Now, substitute d = 2 in equation (1) as follows:
As a result, obtained that for different values of d the height of the plant is different that is the relation between the number of days and the height of the plant is function.
Therefore, the correct option is the relation is a function because the plant can only be one height at a time.