Answer
a, c and d
a. Is the diet deficient in proteins?
c. Has the person been exposed to excessive radiation?
d. Has the person recently suffered severe emotional trauma?
Work Step by Step
In investigating the cause of thinning hair, a, c and d are the questions that needs to be asked.
Hair thinning happens with age. But there are certain factors that quicken the process.
Emotional crisis, anxiety, chemotherapy, radiation, diet deficient in proteins, overconsumption of vitamin A, and fungal diseases like ringworms can cause hair loss or greying. (Page: 156)
