Given the task definition and input, reply with output. In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Question: Who was the head coach for Ajax Youth Academy when Jozefzoon joined? Passage:A Winger and attacking midfielder, Jozefzoon began his career with spells at CTO '70 and AFC. He joined the Ajax Youth Academy in 2006 and signed a three-year professional contract in June 2008. Jozefzoon won his maiden call into the first team squad for the opening match of the 201011 Eredivisie season versus FC Groningen and remained an unused substitute during the 22 draw. He made his senior debut six days later, replacing Urby Emanuelson at half time during a 42 win over SBV Vitesse. He scored his only goal for the club in a 50 KNVB Becker third round win over MVV Maastricht on 22 September 2010. After five appearances during the 201011 season, Jozefzoon signed a one-year contract extension in June 2011, but spent the 201112 season away on loan and was released at the end of the season.
Links: a. SBV Vitesse b. SBV Vitesse c. Ajax Youth Academy d. Ajax Youth Academy
c