A certain alkyl halide $($FOX$)$ undergoes an elimination reaction $($forming an alkene prochuct when treated with $C{H}_{3}O.$ A kinetic study finds that the $C{H}_{3}O$ reacts with the alkyt hallow in a concerted, single step to form the alkene product. What is the rate law tor the rescalon?

A$.$ Rate $=k$

B$.$ Rate $\{C{H}_{3}O)$

Rate $=k(Rx)$

Rate $=k(C{H}_{3}O)$