20. this question is based on the following paragraph. the sentences are numbered to you answer the question.

(1) making rice pudding can be very easy. (2) first, get a large, heavy saucepan. in the pan, measure 3 cups of whole milk, 1 cup of water, 1/2 stick of margarine or butter, and 1/2 cup of rice. (3) bring this mixture to a quick boil. (4) lower heat and slowly simmer for 45 minutes. (5) remove the saucepan from the heat. (6) add one beaten egg, 1/2 cup of sugar, and 1/2 teaspoon of vanilla. (7) stir well. (8) serve warm or cold. (9) enjoy your treat.

the topic sentence of this paragraph is

a. sentence 2.
b. sentence 3.
c. sentence 4.
d. sentence 1.