A researcher wants to test the relationship between sleep and math performances. She recruits 15 subjects. Five the subjects are allocated to a group where they get a good night's sleep, five subjects are allocated to a group where they stay up an entire night, and five subjects are allocated to a group where they are able to fall asleep but are awoken periodically by a cat jumping on them while they try to sleep. All of the subjects also take the math quiz the next morning. Because math quiz performances are also affected by math aptitude, the variable of math aptitude is adjusted for when running the statistical analysis. What type of statistical test should be used for this study?

A. dependent samples (paired) t-test

B. ANCOVA

C. independent samples t-test

D. ANOVA