If a doctor diagnoses that a patient fails to produce enough Vitamin D, which body system is the doctor talking about?

A.
reproductive system
B.
sensory system
C.
endocrine system
D.
integumentary system

In the past week dylan, was laid off from work, was given notice he is in academic probation and was threatened to be evicted from his apartment. as a result, he has increased his usage of alcohol and cigarettes. which of these life skills would beneficial?