A lucky year is one in which at least one date, when written in the form month/day/year, has the following property: The product of the month times the day equals the last two digits of the year. For example, 1956 is a lucky year because it has the date 7 / 8 / 56 and 7 \times 8=56. Which of the following is NOT a lucky year?
Answer Choices
A. 1990
B. 1991
C. 1992
D. 1993
E. 1994