To determine the percentage of bone structure that is composed of water, we need to examine the data and choose the correct option from the given choices.
From our analysis, we know that the correct percentage of water in bone structure is revealed by the following:
1. Examine the given options:
- a. 20%
- b. 5%
- c. 50%
- d. 12%
2. Select the correct percentage:
- The correct percentage of water in bone structure is 50%.
Hence, the answer is:
c. 50%
