Two small forward$-$facing speakers are $2\mathrm{.}50$ m apart. They are both emitting, in phase with each other, a sound of frequency $1100$ Hz in a room where the speed of sound is $344$ m$/$s$.$ A woman is standing opposite the midpoint between the speakers and is initially $35\mathrm{.}0$ m from the midpoint. As she slowly walks parallel to the line connecting the speakers, at what angle $($relative to the centerline coming outward from the midpoint between the speakers$)$ will she first hear no sound? A$)0\mathrm{.}063$ B$)7\mathrm{.}2$ C$)1\mathrm{.}8$ D$)11$ E$)3\mathrm{.}6$