The correct answer to the question is:
D. They do not connect the two poems as a person would expect.
The allusions to Whitman in Galway Kinnell's "Vapor Trail Reflected in the Frog Pond" create tension because they do not establish a clear connection between the two poems as one would typically expect. The reader might anticipate a thematic or stylistic link between Kinnell's poem and the works of Whitman, but the allusions do not fulfill those expectations, thus creating tension.