Which of the following statement is correct?

• Phototrophic bacteria are a group of bacteria, whose energy for growth is derived from sunlight and their source of carbon comes from carbon dioxide or organic carbon.
•  Chemoautotrophs use inorganic energy sources such as hydrogen sulfide, elemental sulfur, ferrous iron, molecular hydrogen, and ammonia. Most chemoautotrophs are extremophiles, bacteria or archaea that live in hostile environments.
•  Hence, Bacteria are either phototropic or chemotropic is correct.
• So, the correct answer is 'Bacteria are either phototropic or chemotropic'.