If a variate \( \mathrm{X} \) is expressed as a linear function of two variates \( \mathrm{U} \)...

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If a variate \( \mathrm{X} \) is expressed as a linear function of two variates \( \mathrm{U} \) and \( \mathrm{V} \) in the form \( X=a U+b V \), then mean \( \bar{X} \) of \( X \) is
(A) \( a \bar{U}+b \bar{V} \)
(B) \( \bar{U}+\bar{V} \)
(C) \( b \bar{U}+a \bar{U} \)
(D) none of these
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