Read the incomplete quatrain.The waves recede, and I am left aloneThey soon return, imploring me to stayI stand and watch though all my hopes have flown

The first and third lines rhyme: “alone” and “flown.” This suggests an ABAB rhyme pattern, so the fourth line should rhyme with “stay.” “Day” does, making “The shore’s a backdrop for my lonely day” the best choice.

AI-written and checked against the verified answer.