Assertion (a) : Ductile metals are used to prepare thin wires.Reason (R): In the stress-strain curve of ductile metals, the length between the points representing elastic limit and breaking point is very small.

• 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)
• Correct answer
  C

  (A) is true but (R) is false
• D

  (A) is false but (R) is true

Hence, the correct answer is option: 'C'.