What is NOT is good laboratory method for preparation of oxygen gas?

is the anwser here C or am i wrong

A)photosynthesis
B)electrolysis of water
C)catalytic decomposition of hydrogen peroxide
D) thermal decompositon of KClO3

Photosynthesis is not a good lab preparation of oxygen gas. It is too slow.

The correct answer in this case would be B) electrolysis of water. To obtain oxygen gas through the process of electrolysis, the equipment required includes a source of direct current electricity, a power supply connected to electrodes (for example, platinum or graphite electrodes), and a container filled with water as the electrolyte. When an electric current is passed through the water, the process of electrolysis occurs, splitting water molecules into hydrogen gas and oxygen gas. However, this method is not commonly used in laboratories due to its high energy consumption and the availability of more efficient alternatives.