What is the most logical next event?

How to make maple syrup
Make sure your trees are ready to be tapped.
Maple season occurs during the spring when nights are below 32 degrees fahrenheit (0 degrees celsius) and days are starting to get warm. This causes the sap to start flowing in trees.

Available options: (I). When you punch trees with your hand, it's sure to slow down the sap through and around the bark joints. Make sure you put a bowl of water in the space between the trees where they're supposed to be tapped.; (II). Use a stopwatch to keep in time since the temperature will vary slightly during late winter. Maple is ideal for beginners in winter because you can get a slower release of sap than other trees.; (III). The best way to make maple syrup is to thaw it out in the refrigerator. The sooner you let it warm up, the better it will taste.; (IV). The maple season is over when this temperature pattern ends. At this time the color of the sap will become darker.;
(IV).