Step 1: Context.
Radha's devotion and longing are centered on Krishna's return.
Step 2: Option Analysis.
(A) Krishna: Correct — Direct reference.
(B) Madhava: Another name for Krishna but not the option chosen in text.
(C) Hari: Also Krishna but not used here.
(D) Sudama: Krishna's friend, not Radha's beloved.
Step 3: Conclusion.
Correct answer is (A) Krishna.