Five balls numbered $1$ to $5$ are suspended using separate threads. Pairs $(1,2), (2,4)$ and $(4,1)$ show electrostatic attraction while pairs $(2,3)$ and $(4,5)$ show repulsion. Therefore ball $1$ must be

  • A

    positively charged

  • B

    made of metal

  • C

    neutral

  • D

    $B$ and $C$ both

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