Sir Humphry Davy was a British chemist who

The correct answer is: C. both (A) and (B)

Sir Humphry Davy was a British chemist who invented the safety lamp for miners and discovered the anesthetic properties of nitrous oxide.

Davy was born in Penzance, Cornwall, England, on December 17, 1778. He was the son of a woodcarver and showed an early interest in science. In 1795, he went to London to study medicine, but he soon turned his attention to chemistry.

In 1799, Davy isolated the element sodium by passing an electric current through molten sodium hydroxide. He also isolated the elements potassium, calcium, magnesium, strontium, and barium.

In 1801, Davy was appointed professor of chemistry at the Royal Institution in London. He gave a series of public lectures on chemistry that were very popular. In 1802, he married Jane Apreece.

In 1805, Davy invented the safety lamp for miners. The lamp had a wire gauze screen that prevented the ignition of flammable gases. The safety lamp was a major breakthrough in mine safety and saved many lives.

In 1807, Davy discovered the anesthetic properties of nitrous oxide. He called it “laughing gas” because it made people laugh when they inhaled it. Davy also experimented with other anesthetics, such as ether.

Davy died in Geneva, Switzerland, on May 29, 1829. He was 50 years old.

Here is a brief explanation of each option:

• Option A: Sir Humphry Davy invented the safety lamp for miners. This is true. Davy invented the safety lamp in 1805. The lamp had a wire gauze screen that prevented the ignition of flammable gases. The safety lamp was a major breakthrough in mine safety and saved many lives.
• Option B: Sir Humphry Davy discovered the anesthetic properties of nitrous oxide. This is also true. Davy discovered the anesthetic properties of nitrous oxide in 1807. He called it “laughing gas” because it made people laugh when they inhaled it. Davy also experimented with other anesthetics, such as ether.
• Option C: Both (A) and (B). This is the correct answer. Davy invented the safety lamp for miners and discovered the anesthetic properties of nitrous oxide.
• Option D: None of the above. This is not the correct answer. Davy did invent the safety lamp for miners and discover the anesthetic properties of nitrous oxide.