78. An unknown compound has the formula C8H10OS, and is known to contain a thiophene ring. Theproton NMR spectrum of this compound is:
 0.98, triplet, 3H; 1.74, multiplet, 2H; 2.80, triplet, 2H; 7.40, multiplet, 1H; 7.55, multiplet, 2H.
What is the structure of this compound?
(A)
(B)
(C)
(D)
(E) none of the above.