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Assertion $(A) :$ Alloys are commonly used in electrical heating devices like electric iron and heater.
Reason $(R):$ Resistivity of an alloy is generally higher than that of its constituent metals but the alloys have low melting points then their constituent metals.

• ✓
  Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of the assertion $(A).$
• B
  Both $(A) $and $(R)$ are true, but $(R)$ is not the correct explanation of the assertion $(A).$
• C
  $(A)$ is true, but $(R)$ is false.
• D
  $(A)$ is false, but $(R)$ is true.