Answer:
C. a tool to measure the ratio of lean muscle to fat
The answer would be D because the proportion is 6:9, which could be simplified to 2:3
There's many options for this but what i have found is the best source for your calcium is yogurt it helps in many ways.
1)30% of your calcium
2)20% of vitamin D
other options-
milk, cheese, eggs, salmon, and spinach
I'm pretty sure it's Primary Care, I hope this helps