Answer:
The correct answer is - option B. Vitamin D-fortified milk
Step-by-step explanation:
At the point when your skin is presented to daylight, it makes vitamin D from cholesterol. The sun's UV or ultraviolet B (UVB) rays hit cholesterol in the skin cells, giving the vitality to nutrient D synthesis.
Vitamin D is an essential nutrient that helps in bone strength and hardness of bones and prevents various diseases and helps in calcium absorption. As it is known that the researcher spends her most of day time inside the cave she can not synthesis vitamin D naturally. Thus, Vitamin D-fortified milk is best for her bones and absorption of calcium as it has added vitamin D to it.
Thus, the correct answer is - option B. Vitamin D-fortified milk