Four students A, B, C, and D looked through pipes of different shapes to see a candle flame as shown in the figure. Who will be able to see the candle flame clearly? $(a)$. A $(b)$. B $(c)$. C $(d)$. D"

A, B, and C looked through the pipes which are not straight. Only A looked through the straight pipe and we know that light travels only in a straight line.

So, option $(d)$ is correct.

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