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What is the correct answer?

4

Dow metal contains

A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

B. 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg

C. 90% aluminium and 90% copper

D. 90% magnesium and 9% aluminium with some copper