Answer: <u>Option C, they digest pathogens</u>
Explanation: Monocytes are involved in the process of digesting pathogens and infected cells, termed as phagocytosis.
Monocytes don't produce antibodies, only B cells can produce antibodies. So, option A and D are incorrect. Also they appear colorless when observed under the microscope. They don't appear granular, so option B is also incorrect.
When your body turns your food into energy it can heat your body which is called cellular respiration. Not sure if this is what you were looking for?
food vacuole or granule:- used to contain food for digestion .
contractile vacuole :- used to remove excess water.
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