C. Graph

A graph is a pictorial representation of the value computed by each statement in the basic block. In computer science, a graph is a data structure that consists of a set of nodes (vertices) and a set of edges connecting these nodes. The nodes represent the statements in the basic block, and the edges represent the flow of control between these statements.

Graphs are commonly used to represent control flow graphs (CFGs) in compiler design and optimization. A CFG is a graphical representation of the flow of control within a program. It shows how different statements in a program are connected and how the program transitions from one statement to another.

A graph representation of the value computed by each statement in a basic block can be visually appealing and provide a clear understanding of the control flow within the block. It allows programmers and designers to analyze the behavior of the program and identify any potential issues or optimizations.

In a graph representation, each statement in the basic block is represented as a node, and the edges between the nodes represent the flow of control between the statements. The direction of the edges indicates the order in which the statements are executed. For example, if statement A is executed before statement B, there will be a directed edge from node A to node B.

By visually representing the value computed by each statement in a basic block using a graph, programmers and designers can easily identify the dependencies between statements and analyze the impact of changing one statement on the others. This can be particularly useful in optimizing the code and improving its efficiency.

In conclusion, a graph is a pictorial representation that best represents the value computed by each statement in a basic block. It allows for a clear visualization of the control flow and helps in analyzing and optimizing the code.