(i) Seven books are placed one above the othe | vedclass

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(C) Let the positions be $1$ to $7$ from top to bottom.From $(iii)$,Geography is $4^{th}$ from bottom,so it is at position $4$. English is $5^{th}$ fr

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There is one book between English and Science books.

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(C) Let the positions be $1$ to $7$ from top to bottom.From $(iii)$,Geography is $4^{th}$ from bottom,so it is at position $4$. English is $5^{th}$ from top,so it is at position $5$.From $(ii)$,History and Civics are adjacent $(H, C)$.From $(iv)$,there are two books between Civics and Economics. If Civics is at $2$,Economics is at $5$ (occupied by English),which is impossible. If Civics is at $3$,Economics is at $6$. If Civics is at $6$,Economics is at $3$ (occupied by Geography),impossible.Thus,Civics must be at $2$ and History at $1$. Then Economics is at $5$ (impossible as English is there). Let's re-evaluate: If Civics is at $6$,then Economics is at $3$ (occupied). If Civics is at $1$,Economics is at $4$ (occupied). Given the constraints,we need to identify the position of the Science book. Option $(c)$ states there is one book between English $(5)$ and Science. If Science is at $7$,there is one book $(6)$ between them. This allows us to fix the positions and calculate the gap between Civics and Science.

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