A: Gold cannot be alloyed.
R: Pure gold has a high melting point and is very soft. Thus, the ornaments made from it do not keep their shape.
a) Both A and R are true, and R is the correct explanation of A.
b) Both A and R are true, but R is not the correct explanation of A.
c) A is true, but R is false.
d) A is false, but R is true.

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