Which of the following sentences is a simple sentence?
A.
Following Umbopa, Allan Quatermain's party was led to the site.
B.
Allan Quatermain's party followed Umbopa, and he led them to the site.
C.
Allan Quatermain and his party followed Umbopa to the site.
D.
Allan Quatermain's party ended up at the site, only after following Umbopa.