A semiconductor \( \mathrm{YBa}_{2} \mathrm{Cu}_{3} \mathrm{O}_{7} \) is prepared by a reaction ...
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0A semiconductor \( \mathrm{YBa}_{2} \mathrm{Cu}_{3} \mathrm{O}_{7} \) is prepared by a reaction involving \( \mathrm{Y}_{2} \mathrm{O}_{3}, \mathrm{BaO}_{2} \) and \( \mathrm{CuO} \). The ratio of their moles should be
(A) \( 1: 2: 4 \)
(B) \( 1: 2: 3 \)
(C) \( 3: 2: 1 \)
(D) \( 1: 1.5: 2.5 \)
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