If we have to convert an ER -Diagram into Relational model then
we can create one table for each entity .In this way we are going to get one table for Entity Person and one table for Entity Exam.we can't avoid these 2 Tables .
Now problem is with relationship Entity on which side should we add it unfortunately we can't add it on either side so we have to create a new table in which we are going to take Primary key of Entity Person and Primary key of Entity Exam .So in this way we can represents the relationship .
So option A ,B and D seems okay but Option C does not make any sense .Why do we need this if we have already represented all our Entity .