Answer:
BEAD
Step-by-step explanation:
On bass clef, the bottom-most line is "G", then the lines following are: "B", "D", "F", and "A". Meanwhile, the spaces from bottom-up are: "A", "C", "E", and "G".
So, the first note is on the second line - that's "B". The next note is in the third space, which is "E". The third note is one the top line, so that's "A". And finally, the last note is on the third line, so that's "D".
Thus, the answer is BEAD.
Hope this helps!