Which of the Following Explains Why Streptococcus Pneumoniae Can Infect

Which of the following explains why Streptococcus pneumoniae can infect an individual recurrently?

A) Previous infection with S.pneumoniae wears down the immune system over time.
B) S.pneumoniae is never completely eradicated during an infection and can reactivate if the host is immunocompromised.
C) Immune responses against S.pneumoniae are serotype-specific and protect only against strains that possess the same capsular polysaccharide antigens.
D) Anti-capsular antibodies are cleared from the host quickly after an active infection.
E) The capsular polysaccharide antigens of S.pneumoniae do not induce immunological memory.