Answer:
Option B - Each invitation costs $1.50 to print
Explanation:
Given : The function

Where,
n: number of invitations
c: cost in dollars
The slope of the line for this case is:

The slope represents the cost of printing of each of the invitations.
Therefore, it is false that the cost of printing of each invitation is $ 1.50
So, Option B is not true
i.e, B- Each invitation costs $1.50 to print