A Researcher Has Observed That Children Who Eat More Sugar

A researcher has observed that children who eat more sugar tend to show a higher level of activity than children who eat less sugar.However,the researcher suspects that the apparent relationship may be explained by the fact that some children have a higher rate of metabolism which causes them to eat more and to be more active compared to children with a lower rate of metabolism who eat less and are less active.This is an example of

A) the directionality problem.
B) the third-variable problem.
C) the extraneous variable problem.
D) the manipulation check problem.

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