He learned to whistle through his teeth. He learned to sleep on rocky earth. He learned that scabies are itchy little mites that burrow into your skin, especially if you’ve worn the same filthy clothes for a week. He learned that a man’s bones really do look white when they burst through the skin. From The Five People You Meet in Heaven by Mitch Albom

Based on the above caption, which inference could best be supported with text evidence?

a
The character is a worn-down traveler who does not have basic necessities for personal hygiene.
b
The character being described is likely a medical student who is studying different injuries and ailments.
c
The person in the caption is likely a soldier in combat.
d
The person being described above is likely living on the streets and unemployed.