On the above mentioned section it mentions how many seats two different kids can sit in. By my reasoning Frank can only sit in seats 1 or 3 and Ruby can only sit in seats 2 or 4 so my answer was (B) Two. It says the correct answer is (C) Three. How is it three not two?

Admin Note: Edited title. Please use the format: "PT#.S#.Q# (G#) - brief description of question”