(D) . Duralumin is an alloy,which is a trade name for the earliest types of age-hardenable aluminum alloys. It is composed of approximately $90 \% \ A

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(D) . Duralumin is an alloy,which is a trade name for the earliest types of age-hardenable aluminum alloys. It is composed of approximately $90 \% \ Al$,$4 \% \ Cu$,$1 \% \ Mg$,and $0.5 \% - 1 \% \ Mn$. It is known for being a very hard and lightweight alloy. Therefore,option $D$ is correct.