Puzzle-5 (CAT-2005)

Three Englishmen and three Frenchmen work for the same company. Each of them knows a secret not known to others. They need to exchange these secrets over person-to-person phone calls so that eventually each person knows all six secrets. None of the Frenchmen knows English and only one Englishman knows French.What is the minimum number of phone calls needed for the above purpose? 

(A) 5          (B) 15            (C) 9           (D) 10

Solution:
Let us name the three Englishmen as E1,E2 and E3 and the three Frenchmen as F1,F2 and F3. Let us consider E1 to be knowing both English and French languages.
See the following table for the sequence of phone-calls. The minimum number of phone-calls required is 9:

Answer:C