Discussion
Which of the following is the group of girls ?
Answer: C
Correct answer: BCD
F sits with only B, so that bench holds exactly those two. A is on bench I and G on bench III. C will not sit with A, E or D, so she must join G on bench III, which leaves D and E to sit with A. The benches are therefore I: A, D, E - II: F, B - III: C, G. Each bench needs a girl: C covers III, so B must be the girl on II, and one of A and D the girl on I - D, since the group of girls named is B, C and D.
C is named a girl; B must be one, because bench II holds only F and B and F is a boy; and D must be one, because bench I holds A, D and E, and E is C’s brother. So B, C and D is the group that is certainly all girls.
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