One third of the members of a parliamentary body are elected every two years. The body has six committees. Each member of the body is a member of at least one committee, and no member is a member of more than two committees. No committee has more than eleven members. Each pair of committees has exactly two members in common. The chairman is a member of the Rules committee and of no other committee. Each member of the Budget committee is also a member of another committee. The last digit of the number of members of the parliamentary body is:

A. 2       B. 3       C. 4       D. 6      

E. It cannot be determined from the information given.