Since we have a right triangle, we can relate the angle 28 with x and side 34 by meand of the sine function, that is,

where x is the hypotenuse. By moving x to the left hand side, we have

and by moving sin28 to the right hand side, we get

since sin28=0.4694, we have

then, x is given by

by rounding down, the answer is option D: x=72.4