Answer:
Bacillus thuringiensis is a bacterium that produces a natural biopesticide. So the answer is **C**.
Penicillium chryssogenum is a fungus that produces penicillin, an antibiotic. Saccharomyces cerevisiae is a yeast that produces ethanol, a biofuel. Lactobacillus buggaricus is a bacterium that produces probiotics, which are beneficial bacteria for gut health. Thiobacillus ferroxidans is a bacterium that oxidizes iron, which is used in the production of steel.
Biopesticides are a sustainable and environmentally friendly alternative to synthetic pesticides. They are often more specific to their target pests, which means they are less likely to harm beneficial insects and other organisms. Biopesticides are also biodegradable, which means they do not persist in the environment.