The untimely death of Professor Hathaway halted his groundbreaking research into the uses of solar power. It therefore appears that Hathaway’s research will not result in practical applications.Which one of the following, if true, most seriously weakens the argument?a. Professor Hathaway’s research can be used by other scientists to create useful applications.b. Not all professors at Professor Hathaway’s university knew that he was conducting research into the uses of solar power.c. Officials at Professor Hathaway’s university have refused requests to make Professor Hathaway’s research public.d. Researchers at other universities are conducting research into the potential applications of solar power.

As per the question, option A i.e. 'Professor Hathaway’s research can be used by other scientists to create useful applications' displays the statement or proposition that weakens the given claim or argument(if true) that 'Hathaway's research will not result in practical applications' as it offers a valid counterclaim that factually neglects the actual claim and shakes the credibility its(actual claim) credibility and lessens its impact and efficacy(if considered true). This statement rejects the given claim by stating that which offers a contradiction or negation to the original argument that says his research could not be used in practical applications. It . Thus, option A is the correct answer.