Which of the following is responsible for producing green light in fireworks?

Barium

The correct answer is option 2. Barium.

The element responsible for producing green light in fireworks is Barium.

Barium compounds, such as barium chloride or barium nitrate, are commonly used in fireworks to produce a vibrant green color when ignited. When the barium-containing compound is heated, the electrons in the barium atoms absorb energy and are excited to higher energy levels. As these electrons return to their ground state, they release the absorbed energy in the form of light, with the characteristic green color associated with barium compounds.