Write the next sentence in this paragraph:

How to make a lemonade slushie
In a blender, blend the lemon, water, and sugar.
Garnish the lemonade slushie with lemon zest and a lemon wedge. Enjoy!
Add the ice, adding one cup at a time, and blending.

Pick from: a. Add the ice for each individual piece of pie. Use lemon juice to thin the ice and to add some sweetness.; b. Pulse the mixture to ensure the lemonade slushie forms. Pour the lemonade slushie into serving glasses.; c. You may need more time or more than you'd like to consider, depending on how much lemonade you're preparing. Add the lime juice, lemon slices, and sugar.; d. Remember to add just enough water to help it penetrate for about 30 seconds. In a small jug, add a cup of water.;
b.