15. A butterfly spread involves writing two call options at one striking price, buying one call option at a lower striking price, and buying one call option at a higher striking price. Suppose you did this by buying 1 of JUN 30 calls ($2.25 each), selling 2 of JUN 35 calls ($1.25), and buying 1 of JUN 40 calls ($ 0.5). How much would be your profits, if, at expiration, the price of a share of the stock is $30, $35, and $40 respectively?

a. -$2.25, $2.5, $1

2. -$0.25, $4.75, -$0.25
3. $0.25, $5.25, $0.25
4. $1.25, $2.25, $1