You should fill in the blank in the following code with ______________.

public class Test {
public static void main(String[] args) {
System (The grade is );
printGrade(78.5);

System (The grade is );
printGrade(59.5);
}

public static __________ printGrade(double score) {
if (score >= 90.0) {
System.out.println('A');
}
else if (score >= 80.0) {
System.out.println('B');
}
else if (score >= 70.0) {
System.out.println('C');
}
else if (score >= 60.0) {
System.out.println('D');
}
else {
System.out.println('F');
}
}
}

A. int
B. double
C. boolean
D. char
E. void