The table shows the grades obtained by a group of students in an examination. Grade Number of students A 45 B 60 C 80 D 15 If the given information is illustrated using a pie chart, what is the angle of the sector that represents grade A?

• A.  \[{{45}^{o}}\]      
• B.                                                         \[{{81}^{o}}\]                   
• C.                         \[{{65}^{o}}\]                                   
• D.                         \[{{100}^{o}}\]