Martin was a professional classical guitar player until a motorcycle accident left him disabled. After long months of therapy, he hired an experienced luthier $($a maker of stringed instruments$)$ and started a small shop to make and sell Spanish guitars. The guitars sell for $$800,$ and the fixed monthly operating costs are as follows:

Rent and utilities

Wages and benefits to luthier $$2,100$

Other expenses

$$471$

Martin's accountant told him about contribution margin ratios, and Martin understood clearly that for every dollar of sales, $$0\mathrm{.}65$ went to cover his fixed costs, and anything above that point was profit.

Martin wishes to earn $$2,500$ of operating profit each month. Calculate the number of guitars Martin will need to sell to achieve the target profit. $($Round your answer up to the nearest whole guitar.$)$

A$.5$ guitars

B$.12$ guitars

C$.3$ guitars

D$.10$ guitars