Bacteria are either heterotrophic or chemoautotrophic.
Bacteria are either phototropic or chemotropic.
Bacteria are either photoautotrophic or chemoautotropic.
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Correct option is C)
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'.