Investor B sold a put option and bought a call option when the stock price is $30. The strike price for both options is $35. Premiums on call and put is $3.55 and $4.05 respectively. At the time of maturity, the stock is trading at $48. How much B earned as profit?

a) $5.40

b) $17.50

c) $18.50

d) $13.50