ฺBut if the price of the call option is higher than $3.33, then the market will be flooded with people trying to sell such options.
Thus the arbitrage price of the call option must be C=$3.33.
This is sensibly lower than the overpriced $4 we used earlier.
Value an option first by finding how one could hedge against risk, and second by equating such a risk-free portfolio to investment in bonds.