The first thing presented is an eighth rest, thus being only half a beat.
The next one is a quarter note which is only one beat. The last note presented is an eighth note, which is also half of a beat, like the eighth rest.
Therefore, this measure can be counted depending on the number of beats. Two half beats and one whole beats makes two total beats.
Thus - under the notes should be the beats (1/2, 1, etc), and the time signature should be 2 over 4.
Hope this helps!
