Step 1: Context.
Radha is traditionally associated with Lord Krishna, and the text notes their separation.
Step 2: Option Analysis.
(A) Rukmani: Krishna's wife, not the reference here.
(B) Sita: Wife of Rama, unrelated.
(C) Radha: Correct — Krishna had not met Radha.
(D) Draupadi: Not related to this context.
Step 3: Conclusion.
Correct answer is (C) Radha.