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?
Choose the correct choice from the following:  A) 5  B) 8  C) 11  D) 15  E) 17
Explanation :   Let a, b, c be the Englishmen and d, e, f be the Frenchmen.   Let a be the Englishman who knows French. 'a' calls 'b &amp; c' and now knows the secret of both of them. So now 'a' knows 'abc' secrets. 'd' calls 'e &amp; f' and now knows the secret of both of them. So now 'd' knows 'def' secrets. 'a' now calls 'd', and exchange all secrets in French, so now 'a' and 'd' know all the 6 secrets. Now 'a' calls 'b &amp; c' again, and 'd' calls 'e &amp; f' again and tell all the secrets. So, totally 9 calls.   Answer : 8
<result>B</result>
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?