Question: I am thinking the answer is D a matched pairs design can someone confirm that I'm on the right track here please. Will a fluoride

I am thinking the answer is D a matched pairs design can someone confirm that I'm on the right track here please.

Will a fluoride mouthwash used after brushing reduce cavities? Twenty sets of twins were used to investigate this question. One member of each set of twins used the mouthwash after each brushing, the other did not. After six months, the difference in the number of cavities of those using the mouthwash was compared with the number of those who did not use the mouthwash. This experiment uses

Group of answer choices

random placeboes.

double replication.

double-blinding.

a matched pairs design.

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