Robert Browning's "The Inn Album" was originally conceived as a play, though he later published it as a poem. It explores themes of love, jealousy, and betrayal and reflects Browning's interest in dramatic monologues.
Option (A) "Men and Women" is a collection of poems, but it was not intended as a play.
Option (B) "Dramatis Personae" is another collection of poems, not a play.
Option (D) "The Ring and the Book" is also a long narrative poem, not intended as a play.
\[
\boxed{\text{The correct answer is (C).}}
\]