A batsman on 99 leg glances and gets a single to get a test ton.His partner completes the single and turns around to congratulate his partner.The keeper whips the bails off and he's given out.The centurion and the unfortunate congratulator are

This refers to a famous Test match incident where Kumar Sangakkara scored a century and Muttiah Muralitharan was the non-striker who came to congratulate him. As Muralitharan crossed to congratulate his partner, the wicketkeeper whipped off the bails and he was given out run out. The centurion was Sangakkara and the unfortunate congratulator who was run out was Muralitharan. Option A correctly names both players involved in this unusual dismissal.