Chemistry unit 4 doubt

[OrlandoBloom<3]

hey everyone , please can someone explain why the answer to this multiple choice questions is B ? How can I decide whether it gives racemic mixture or not?
http://www.edexcel.com/migrationdocuments/QP%20GCE%20Curriculum%202000/January%202012%20-%20QP/6CH04_01_que_20120307.pdf
question 10(a)