There are \( 2 \mathrm{n} \) white and \( 2 \mathrm{n} \) red count...

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There are \( 2 \mathrm{n} \) white and \( 2 \mathrm{n} \) red counters. Counters are all alike except for the colour. If the number of ways in which they can be arranged in a line so that they are symmetric with respect to a central mark
\( \mathrm{P} \) is 70 then \( n \) equals to
(A) 3
(B) 4
(C) 5
(D) 6
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