A project has three test cases. Three teams are formed to study the three different test cases. James is assigned to all three teams. Except for James, each researcher is assigned to exactly one team. If each team has exactly 8 members, then what is the exact number of researchers required?	Choose the correct answer
A) 23  B) 22  C) 21  D) 20  E) 19
alternatively, we have   8*3-2( because james is included in all the three teams)   =22   22
<result>B</result>
A project has three test cases. Three teams are formed to study the three different test cases. James is assigned to all three teams. Except for James, each researcher is assigned to exactly one team. If each team has exactly 8 members, then what is the exact number of researchers required?