Which of the following flowchart symbols represents the if selection structure?

The correct answer is: A. diamond.

A diamond is a flowchart symbol that represents a decision point. It is used to indicate that the flow of control will branch depending on the outcome of a condition.

The other options are incorrect because they do not represent a decision point.

• A hexagon is a flowchart symbol that represents a process. It is used to indicate that a series of actions will be performed.
• An oval is a flowchart symbol that represents the start or end of a flowchart.
• A parallelogram is a flowchart symbol that represents a data input or output.
• A rectangle is a flowchart symbol that represents a function call.