Micronutrients are called micro, because they are

Answer: Option C

Micronutrient requirements are in amounts generally less than 100 milligrams per day. There are about seven nutrients essential to plant growth and health that are only needed in very small quantities. Though these are present in only small quantities.
Micronutrients are essential dietary elements required by organisms in varying quantities throughout life to orchestrate a range of physiological functions to maintain health.