This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to make membrillo (quince paste )
Prepare the quinces for cooking.
Thoroughly wash the quince fruits. Peel and cut the flesh into cubes.

Select from: 1. Place them on a cutting board cut thin as per the puree, and place in a floured pot. Place the quinces into a salted water solution. 2. Transfer the fruit cubes and water (lemon, grapefruit, lime) into a bowl with the quinces and water. Marinate the fruit and water cubes for 15 to 30 minutes or until it is firm, but not too hard. 3. Discard the stem and any fruit that is less than perfect. Sometimes quinces that look beautiful outside can have brown parts inside or they might contain a visitor (like a worm). 4. Drain the rinds in a colander. Combine the ingredients in a medium saucepan.
The answer is:
3.