3) C

The diamond which is to the far right must represent the student who scored the highest on test 1. That must be Hazel. 

Moving backwards from the far right, the white diamond must represent the person who got the fifth-highest mark on test 1. The order of scores are: 94, 88, 74, 73, 63. The person who scored the fifth-highest on test 1 is Erin (63).

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