Yup only the right to buy em. So you are paying a 2200 premium ontop so 135x100 = 15700
if u just bought them today at 154 it would cost 15400
the benefit is you only put up 2.2k instead of 15,400
options pricing moves with the stock price so if it goes to 23 for the option price you made 1$ x 100 shares = $100.
the way you make fist loads is buying options out of the money and hope the volume swings your option into the money and the further into the money you are the even more you make. you see this in your example you have to pay an addition 300$ for your play because it is well into the money so even if it swings you are still in the money. If you do the math on a 150 155 160 190 call option for may you will see the value/premium differences.
its easier to explain it when its out of the money like this:
if you believe the price of a stock currently trading at $50 a share will rise, you might buy a call with a strike price of $52. If the stock's price rises to $55 a share at expiration, you can purchase the shares at the $52 a share, or $3 a share under market value. Keep in mind, your profit is $3 a share less the cost of the option.