Question

multiple choice question the oxygen produced during photosynthesis comes from
carbon dioxide spilt by an enzyme.

a water molecule spilt by an enzyme.

a water molecule spilt by energy from the sun.

carbon dioxide spilt by the energy of the sun.

Explanation:

In photosynthesis, the light - dependent reactions involve the splitting of water molecules ($\ce{H_2O}$). The energy from sunlight (photons) is absorbed by chlorophyll and other pigments. This energy is used to split water molecules into hydrogen ions, electrons, and oxygen gas ($\ce{O_2}$). Enzymes are not directly involved in the splitting of water for oxygen production in this context, and carbon dioxide is used in the Calvin cycle (light - independent reactions) to form glucose, not to produce oxygen. So the oxygen produced during photosynthesis comes from a water molecule split by energy from the sun.

Answer:

a water molecule split by energy from the sun.