Read the recipe and answer the question.
Spicy Lentil Stew
To make spicy lentil stew, rinse one cup of red lentils under cold water. Then, heat two tablespoons of oil in a pot over medium heat and sauté one chopped onion until it becomes soft. Add two cloves of minced garlic and one teaspoon of cumin, then stir for one minute. Pour in the lentils along with three cups of vegetable stock and bring everything to a boil. Once it is boiling, reduce the heat and let it simmer for twenty minutes. Stir in one tablespoon of lemon juice and season with salt and chilli flakes before serving.
What do you do immediately after the stew comes to a boil?
A)Add the lemon juice and season with salt.
B)Sauté the onion until it becomes soft.
C)Pour in the lentils and vegetable stock.
D)Reduce the heat and let it simmer.