Multi-choice problem: Continue writing the next sentence in this paragraph:

How to make an oreo milkshake
Prepare the glasses.
Chill glasses in the freezer for about 15 minutes, or until slightly frosty. This will keep your milkshake from melting too quickly.

Pick from:
[1]. Chill your glass in the freezer overnight for best results. Be sure to use cold glasses for your milkshake because the cornstarch may be freezing.
[2]. You can make one giant milkshake, or divide it among several smaller glasses. Drizzle syrup into the glass (es).
[3]. On the day of the party, make sure to chill glasses for approximately 6 hours. Do not mix the milkshake with ice cream, shake or slosh any cornstarch into the glasses until fully blended.
[4]. On the other hand, if you push the ice cubes around too quickly, they may melt and mess around and make you lose your milkshake. This step is optional so as to not freeze your milkshake.
[2].