Which of the Following Is a Confound, Preventing Researchers from Concluding

Which of the following is a confound, preventing researchers from concluding that bilinguals have an advantage in cognitive control?

A) Bilinguals are known to be smarter on average, making them better at language learning.
B) Bilinguals have a wide variety of different language experiences and different amounts of exposure to their two languages.
C) Cultural effects from bilinguals' native countries interfere with their ability to complete certain kinds of tasks similarly enough to monolinguals.
D) Interference from bilinguals' native languages interferes with their second language, preventing them from completing assessments in the same way as monolinguals.