Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which State (class) has a Successor of harry f. byrd, jr. (d)? Question

### Inputs:
table_name: table, columns: ['State (class)', 'Vacator', 'Reason for change', 'Successor', "Date of successor's formal installation"]

### Response:
SELECT State (class) FROM table WHERE Successor = harry f. byrd, jr. (d)