Select the correct text in the passage.
 which detail in the cyclists' dialogue refines the idea that they might be related?
 (19) "this is confusing,." he remarked in a tone of argument. "let's sit down and have a pipe over it--we shall have to
 differentiate ourselves before we start out into the world together.".
 (20) "let's differentlate our names somehow." sald the pleasant-volced one lazily--"did your godfathers, etc., do anything
 more for you than edward--mine didn't."
 (21) the other shook his head. something in his handsome face had already differentlated itself from the amused curlosity
 on his companion's.
 (22) " that's awkward-we shall be driven to abbreviations. you shall be ted, and i ned-both dentals but philologically
 uninterchangeable; so they'll do for the present. well, ted, since you are twenty-seven and i'm gone twenty-nine, and my
 father died before i was born, we can't be complicated up as long- lost brothers--can we?"
 (23) ted turned to him frowning sharply--"nol but--but what put that into your head. i
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