Ajax was a professional classical guitarist 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 $$700,$ and the fixed monthly operating costs are as follows:

Rent and utilities

Wages and benefits to luthier

Other expenses

$$700$

$$2,400$

$471$

Ajax's accountant told him about contribution margin ratios, and Ajax understood clearly that for every dollar of sales, $$0\mathrm{.}70$ went to cover his fixed costs, and anything above that point was profit.

How many guitars does Ajax need to sell each month to break even? $($Round your answer up to the nearest whole guitar.$)$

A$.7$ guitars

B$.3$ guitars

C$.8$ guitars

D$.6$ guitars