This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to take l carnitine
Boost low carnitine levels.
When the body does not absorb or make sufficient carnitine, doctors will prescribe oral l-carnitine.
Carnitine levels may be low because of many reasons.

Choose your answer from: i. Some carnitine deficiencies are due to exposure to light, while others are due to severe fevers. In most cases, light decreases carnitine levels by about 75 percent or lower.. ii. Certain diabetes, high cholesterol levels, and higher levels of insulin could affect the absorption of l carnitine. Certain chronic conditions may interfere with the production of l carnitine in your body, such as diabetes, high blood pressure, heart disease, osteoporosis, and kidney disease.. iii. Some health conditions could limit or prevent l-carnitine production. Just as your body cannot absorb l-carnitine from foods that you consume, your body also cannot absorb it from products that you drink.. iv. Genetic disorders are the most common, but medical procedures such as hemodialysis also drain the body of l-carnitine temporarily. Vegetarians or anyone who is on a strict diet may also have low carnitine levels..
The answer is:
iv.