Infantile umbilical hernia passes through the umbilical scar (cicatrix), while the adult form is usually paraumbilical (through the linea alba next to, mostly above, the umbilicus), so A is true. Women are affected more than men (B is wrong). Infantile hernias usually close by about 2 years and need no immediate surgery (D is wrong). However, the Afnan notes also describe adult paraumbilical hernia as commonly irreducible, with omental contents and adhesions in the sac. That makes C arguably true for adults as well.