In a WAEC English Language essay examination, a candidate's work is assessed under Content, Organisation, Expression, and Mechanical Accuracy. If a candidate scores 6 out of 10 for Content, 5 out of 7 for Organisation, 6 out of 10 for Expression, and 2 out of 3 for Mechanical Accuracy, what is the candidate's total score?
A18
B19CORRECT
C20
D21