This is a question with answer options. Goal: how to mix grout

Which of the following methods is more reasonable for accomplishing this goal?

Pick your answer from:
A). Mix the Grout. Mix the grout by pouring the water in first, and then add the powder, and stir with a margin trowel. Mix to a smooth (like toothpaste) consistency, let sit for twenty five minutes, then mix again. Note: The thickness of your joint will determine if you can use sanded or unsanded grout.
B). Mix the Grout. Mix the grout by pouring the water in first, and then add the powder, and stir with a margin trowel. Mix to a smooth (like toothpaste) consistency, let sit for five minutes, then mix again. Note: The thickness of your joint will determine if you can use sanded or unsanded grout....I think the answer is
B).