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Speed of Sound in Dry Air

Which of the following is the closest formula to find the speed of sound in dry air? ( $\gamma=1.4$, M=28.97 gm/mole)

(A) $v=\sqrt T. 20$	(B) $v=\sqrt {T.20}$
(C) $v=T.20$	(D) $T20$ is related to Cricket only

${\scriptscriptstyle 6 + f(x) = 2f( – x) + 3{x^2}\int\limits_{ – 1}^1 {f(t)dt}}$
$\scriptstyle f(x) = {\left( {\frac{x}{\pi }} \right)^x} + {\left( {\frac{\pi }{x}} \right)^x}$
$\scriptstyle \sqrt {7 – \sqrt {7 + \sqrt {7 – \sqrt {7 + …..} } } }$
$\scriptstyle f(x) = \int\limits_0^x {{\pi ^t}(t – e)(t – \pi )dt} $
$\scriptstyle 7f(x) + 5f\left( {\frac{1}{x}} \right) = x + 1$ …

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