Sea turtles nest only at their own birthplaces. After hatching on the beach, the turtles enter the water to begin their far-ranging migration, only returning to their birthplace to nest some 15 to 30 years later. It has been hypothesized that newborn sea turtles learn the smell of their environment, and it is this smell that stimulates the turtles to return to nest.
Which one of the following, if true, would cast the most serious doubt on the hypothesis in the passage?
Argument says that the smell is responsible for sea turtles returning to their nesting place even after 15-20 years. Something other than smell, if responsible, would definitely weaken the claim.
(A) Beaches on which sea turtles nest tend to be in secluded locations such as on islands. - WRONG. It strengthens the argument instead for the smell is so helpful that secluded locations is identifiable by sea turtles even after 15-20 years.
(B) Sea turtles exposed to a variety of environments under experimental conditions preferred the environment that contained sand form their own birthplaces. - WRONG. Even an exposure to various types of environments the turtles prefer that same smell from its birthplace. Strengthens.
(C) Electronic tags attached to sea turtles did not alter their nesting patterns. - WRONG. Surely it does not weaken at all, however, may strengthen instead.
(D) Unlike other types of turtles, sea turtles have a well-developed sense of smell. - WRONG. Does not offer anything to weaken/strengthen.
(E) Sea turtles that have their sense of smell destroyed by exposure to petroleum products returned to nest at their own birthplaces. - CORRECT. Even after losing sense of smell some turtles return to their birthplace signifies that there is something other than smell with the help of which turtles are able to do so.
IMO Answer E.