What is a mixture of Potassium Nitrate Powdered Charcoal and Sulphur called?

✅ B. Stapes

✅ D. William Harvey

✅ C. Ammeter

✅ A. Atmosphere

✅ B. Atoms

✅ D. Uninterruptible Power Supply

✅ D. A stereoscope

✅ C. 40 degrees