I am doing a stop option price for HCA, which is as follows, I have no idea how to do the following question, can someone please help me. Thank you!

Provide a review of these option prices based on the comparison between the European optionpricefromyourcalculationand theactualoptionpriceyouobservedinthemarket.(6marks)

I think use Marketwatch, however, I am really unsure how to do the following question, I won't be able to give you any further references. Any help will be appreciated, thank you!