third person, the explaination is because it doesn't use "I" or "We" In most recipes, its directing you of what you need to do for the recipe and to do it correctly
A is wrong because it’s not starting with an assumption but it’s starting with an opinion.
B is wrong because it’s an opinion as well
C is wrong because it’s just a quote
D is the right answer because it started out with an assumption and ended with an argument starter
hope this helped !