The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Sulphur can easily combine with metals such as iron, copper, zinc etc. to produce sulphides.
When sulphur is heated with iron filings, ferrous sulphide is formed.
Fe(S)+S(s)→FeS(s)
Ferrous Sulphide
Reaction of sulphur with metals is exothermic.
Correct answer is option (A).