Answer: C: Harry's order will be executed at the applicable "bid" price.
Explanation:
Bid price is the price at which a buyer is willing to buy the shares and Ask price is the price at which a seller is willing to sell the shares. When Harry wants to buy shares he will make a bid price, that means he is willing to buy x amount of shares at the bid price. When there is a seller willing to sell at the bid price then the order will be executed.