(b) Ranu is an ordinary sportsperson. In the last two university sprint events, her performances in the heats were pathetic. So statements that show her as a great sportsperson will weaken the argument. So (a) is wrong as it does not show Ranu to be a great sportsperson. The rest of the 4 options show that he is a good/ great sportsperson, so the one which will show her to be the greatest sportsperson would weaken the argument the most. (d) and (e) show her to be a college level sportsperson, so they are wrong. Among (b) and (c), (b) is the answer as it shows her to be a national shot-put champion, whereas (c) does not mention any such level of hers.