The head of a matchstick contains a mixture of antimony trisulphide, potassium chlorate, starch, and some glue. For combustion, it is struck against a rough surface made of powdered glass and red phosphorus. Which of the following substances will be the first to get ignited when the match is struck against a rough surface?

• A.  Antimony trisulphide   
• B.  Potassium chlorate
• C. amino acid composition
• D.  Powdered glass