Can anyone help with trills please in exam piece 'Menuett in G' K15c, for grade 2. Not sure what notes I should be playing and how to put left and right hand together.

the first trill is in bar 4, and the notes are D, C and B and the trill is above the middle note i.e the C! The three left hand notes are A, F and G.
Any help on how to play these and what notes should be played would be very much appreciated! Thanks, A