Задача . 37467

A simple Tic-Tac-Toe board is a 3 × 3 array filled with either X’s, O’s, or blanks.
Here is a class for a game of Tic-Tac-Toe:

public class TicTacToe
{
  private String[][] board;
  private static final int ROWS = 3;
  private static final int COLS = 3;
  
  /** Construct an empty board. */
  public TicTacToe()
  {
    board = new String[ROWS][COLS];
    for (int r = 0; r < ROWS; r++)
      for (int c = 0; c < COLS; c++)
        board[r][c] = " ";
  }

  /** @param r the row number
  * @param c the column number
  * @param symbol the symbol to be placed on board[r][c]
  * Precondition: The square board[r][c] is empty.
  * Postcondition: symbol placed in that square.
  */
  public void makeMove(int r, int c, String symbol)
  {
    board[r][c] = symbol;
  }
  
  /** Creates a string representation of the board, e.g.
  * |o |
  * |xx |
  * | o|
  * @return the string representation of board
  */
  public String toString()
  {
    String s = ""; //empty string
    /* more code */
    return s;
  }
}

Which segment represents a correct replacement for /* more code */ for the toString method?
(A)

for (int r = 0; r < ROWS; r++)
{
  for (int c = 0; c < COLS; c++)
  {
    s = s + "|";
    s = s + board[r][c];
    s = s + "|\n";
  }
}

(B)

for (int r = 0; r < ROWS; r++)
{
  s = s + "|";
  for (int c = 0; c < COLS; c++)
  {
    s = s + board[r][c];
    s = s + "|\n";
  }
}

(C)

for (int r = 0; r < ROWS; r++)
{
  s = s + "|";
  for (int c = 0; c < COLS; c++)
    s = s + board[r][c];
}
s = s + "|\n";

(D)

for (int r = 0; r < ROWS; r++)
  s = s + "|";
for (int c = 0; c < COLS; c++)
{
  s = s + board[r][c];
  s = s + "|\n";
}

(E)

for (int r = 0; r < ROWS; r++)
{
  s = s + "|";
  for (int c = 0; c < COLS; c++)
    s = s + board[r][c];
  s = s + "|\n";
}