• C. Sub-blocks cannot reuse a parent block’s variable name: This is accurate because a variable declared in a parent block cannot be redeclared in a child block within the same scope. The sub-block has access to the parent block’s variables and cannot redefine them.
• D. Parallel blocks can use the same variable name: This is true because parallel (or sibling) blocks are separate scopes, so they can each have their own variable with the same name without conflict.
• E. A variable can be defined at any point in a block: This is accurate. Variables can be declared anywhere within a block, and their scope will extend from the point of declaration to the end of the block.