What are the clinical manifestations of acute pharyngotonsillitis?

The most common cause is viral infection.
The most common bacterial cause is Streptococcus β-hemolytic group A.
The most common bacterial cause is Mycoplasma.
The most common bacterial cause is Streptococcus beta hemolytic group C.
a) Only I and II are correct.
b) Only II and IV are correct.
c) Only I and III are correct.
d) Only II and III are correct.