Jay, who lives in London, invested £4 million in JMDJ, a U.S. company, trading at a market value of $100 per share. The conversion rate for pounds to dollars was £1 to $1.4 at the time of the investment. Assume that after two years, he sells the stock, for $250 per share when the conversion rate for pounds to dollars is £1 to $1.30. How much is his gain?

a). £6.8 million.
b). £8.4 million.
c). £10 million.
d). £10.8 million.