The question that would best help someone complete the recipe is "Which kind of potatoes are best to use?", as stated in option B and explained below.
<h3>How to complete the recipe</h3>
After reading the recipe provided in the question, we can tell it is for mashed potatoes. Since mashed potatoes are not supposed to be a soupy dish, it's easy to understand why the potatoes must be drained. Therefore, we can eliminate letter A.
We do not know, however, what kind of potatoes are best to use. Since the recipe does not mention that, the question that would best help someone complete the recipe is "Which kind of potatoes are best to use?" Option B is the correct answer.
We can eliminate letter C because the recipe tells us when to add the butter. Letter D is also incorrect because the meaning of a speck is not the kind of information that would appear in a recipe whatsoever.
With the information above in mind, we can choose option B as the correct answer.
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