Greenhouse gases present in very high quantity is

The correct option is carbon dioxide.

Greenhouse gases are gases in Earth's atmosphere that trap heat. They let sunlight pass through the atmosphere, but they prevent the heat that the sunlight brings from leaving the atmosphere. This process is known as the greenhouse effect.

Among the common greenhouse gases in Earth's atmosphere, carbon dioxide (CO₂) is present in a much higher concentration compared to others like methane (CH₄), nitrous oxide (N₂O), and fluorinated gases.
While water vapor is technically the most abundant greenhouse gas overall, among the primary long-lived anthropogenic (human-emitted) greenhouse gases, carbon dioxide is by far the most dominant in terms of quantity and concentration, making up the vast majority of greenhouse gas emissions globally.

Therefore, carbon dioxide is the greenhouse gas present in a very high quantity.