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In plants, photosynthesis produces:

  1. Oxygen

  2. Carbon

  3. Fatty acids

  4. Glucose

The correct answer is: Glucose

Plants are capable of producing glucose through photosynthesis. Photosynthesis is a process that converts sunlight, water, and carbon dioxide into glucose, which is a form of sugar. The glucose produced is then used by plants as a source of energy. This is why option D, glucose, is the correct answer. Option A, oxygen, is also produced during photosynthesis, but it is not the primary product. Option B, carbon, is a component of glucose but it is not the end product of photosynthesis. Option C, fatty acids, are not produced during photosynthesis.