The correct composition of Babbit metal is__________________?
A. 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi

B. 87% Sn, 4% Cu, 8% Sb, 1% Al

C. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg

D. none of the above

E. 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg

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