PLEASE HELP ME *ASAP* DUE SOON

Which answer gives the correct sequence of the first humans in space?

A.Yuri Gagarin, Alan Shepard, John Glenn

B.John Glenn, Yuri Gagarin, Alan Shepard

C.Yuri Gagarin, Sputnik, Alan Shepard

D.Alan Shepard, John Glenn, Yuri Gagarin