. . . . . . . . in flowchart is used to represent a for clause.

The correct answer is B. Rectangle.

A rectangle is used to represent a for clause in a flowchart. A for clause is a control flow statement that allows you to repeat a block of code a specified number of times. The syntax for a for clause is as follows:

for (initialization; condition; increment) {
// code to be executed
}

The initialization statement is executed once, before the loop begins. The condition statement is evaluated before each iteration of the loop. If the condition is true, the code inside the loop is executed. The increment statement is executed after each iteration of the loop.

Here is an example of a for loop:

for (int i = 0; i < 10; i++) {
System.out.println(i);
}

This loop will print the numbers from 0 to 9.

The other options are incorrect because they are not used to represent a for clause in a flowchart. A circle is used to represent a start or end point, a parallelogram is used to represent a decision, and a hexagon is used to represent a process.