Final answer:
The symbol used for an assignment statement in a flowchart is a parallelogram.
Step-by-step explanation:
The symbol used for an assignment statement in a flowchart is d) Parallelogram.
Assignment statements are used to assign a value to a variable. In a flowchart, a parallelogram is used to represent an assignment statement. This symbol is usually labelled with the variable name and the assigned value.
For example, if you have a variable named 'x' and want to assign it the value of 10, you would use a parallelogram symbol in the flowchart and label it as 'x = 10'.