In chess which of the following may move only diagonally?

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Step-by-step explanation:

1. Bishop: The bishop moves any number of squares but only along diagonals. In coordinate terms, a bishop's move satisfies $|\Delta	ext{file}|=|\Delta	ext{rank}|$, so it is strictly diagonal.

2. Knight: The knight moves in an "L"-shape (two squares in one direction and one perpendicular), so it does not move only diagonally.

3. Queen: The queen can move any number of squares along ranks, files, or diagonals, so it is not restricted to diagonal moves only.

4. Rook: The rook moves any number of squares along ranks or files (horizontal or vertical), not diagonally.

Therefore only the Bishop (1) moves only diagonally, so the correct option is (1) only — corresponding to answer a.

FINAL_ANSWER: a

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