If the stock is at or below $ 50 on option expiration day then the call option expires worthless. (borntosell.com)
Usually these kinds of investors sell in the money options and they're hoping to be called out of most of their positions on option expiration day. (borntosell.com)
If the stock is over $ 50 on option expiration day then the person who bought your call option will exercise it — meaning they will buy your stock from you for $ 50 / share. (borntosell.com)