Answer:
To attempt to buy the stock as soon as the stock trades at a bid price of $18.7 or less.
Explanation:
We have placed a stop order to sell the stock of Marriott at $18.7 when bid ask Marriott is $18.61 and $18.80, however if the broker sell the stock for less than $18.7 it will be considered a loss which is not the case in a stop loss order. therefore the stop order will be to buy the stock at a price of $18.7 or less which can be sold for $18.7 or more in future to avoid loss on selling the stock.