Ethyne is widely used for cutting and welding iron and steel.
Reason (R): Ethyne is an unsaturated hydrocarbon involving a carbon-to-carbon triple bond.

a) Both Assertion and Reason are true, and Reason is the correct explanation of the Assertion.
b) Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion.
c) Assertion is true, but Reason is false.
d) Assertion is false, but Reason is true.