which iteration must have an expression that has a true or false value?
a: a for loop
b: a while loop
c: a last variable loop
d: a break loop

b: a while loop

Explanation:

Because in while loop iteration must have an expression that it is true of false value. if it is true than it is continue otherwise it will be stop iteration when its value become false.

a: a for loop iteration depends on value that is enter in the command , when it will reached that value than for loop will be ended and exit the loop.

for (int i=0; i<=10; i++){

statement;

}

d: in a break loop the iteration will be immediately stop when break statement encountered in the loop, and program control goes to the next  statements. it is used to terminate the case in switch statements.