After taking the morning-after pill, which of the following statements accurately describes its effectiveness when engaging in unprotected intercourse shortly after?
A) The morning-after pill is most effective when taken within 24 hours after unprotected intercourse.
B) The morning-after pill provides complete protection from all sexually transmitted infections (STIs).
C) The morning-after pill prevents pregnancy in all cases, regardless of the timing of subsequent intercourse.
D) The morning-after pill is ineffective if additional unprotected intercourse occurs within the same menstrual cycle.