Children who are fluent in two languages:
A. are behind in detection of errors in grammar and meaning
B. outperform others on tests of cognitive flexibility
C. have difficulty on selective attention tasks
D. are behind in reading achievement tests in both languages

B. outperform others on tests of cognitive flexibility

Explanation:

Children that are bilingual have better cognitive abilities and tend to outperform other children on tasks that require cognitive skills.

Bilingual children tend to be smarter because their brain works faster and perform better. Such children tend to identify colors, shapes faster than children that speak only one language.  This is because the brain "switches" between the two languages which make the brain work harder than it normally would and it makes the brain make better decisions and generally be better ijin cognitive tests. People that speak more than one language do not suffer dementia as fast as people that are monolingual

B. outperform others on tests of cognitive flexibility

Explanation:

Children who are fluent in two languages outperform others on tests of cognitive flexibility. This reveals that such children exhibit high level of IQ to retain information and learning. Their cognitive flexibility gives them an edge over their peers.

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