Door locks are made of metals because metals:

have lustre

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are opaque

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are good conductors of heat

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are hard and strong

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Solution

The correct option is B are hard and strong
Door locks need to be strong to make sure they are secure. So, we need a hard and strong material for the manufacturing of locks, and metals are most feasible for this purpose.

Metals have lustre, are opaque and good conductors of heat, but these properties have nothing to do with them being used to make locks.

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