Let Englishmen be E1, E2 and E3 and Frenchmen be F1, F2 and F3. Presuming E3 knows French, so 5 calls are required so that E3 knows everybody’s secret and everybody knows E3’s secret. One call would from E1 to E2. Besides this, 3 calls i.e. F1 to F2, F2 to F3 and F1 to F3.
Hence total number of calls = 5 + 1 + 3 = 9. So answer is 3rd option.