Which member of the rhythm section is responsible for giving cues about upcoming changes in the music or that a new section of music is about to occur?

drums
bass
piano
saxophone

My answer- bass

3 answers

seems to me that "drums" is the only member of the rhythm section.

the others are strings or winds.
I believe the answer to be drums. When the song/music is about to change in jazz band, the drummer usually does a crash or a fill.
Definitely the drummer. Drummers do what is called "setting up" the band for a transition by playing either a fill or a loud note right before the band needs to play a loud note together.

Source: I'm a drummer.