Choose the letters whose water images are identical to the letter itself.

(A) k
(B) z
(C) x
(D) o

Choose the correct answer from the options given below:

(C) and (D) only

The correct answer is Option (4) → (C) and (D) only

(A) k: The lowercase 'k' does not have horizontal symmetry. Its water image would appear inverted, with the ascending stem pointing downwards and the "kick" part flipped. (Different)

(B) z: While it looks similar, lowercase 'z' does not have a horizontal axis of symmetry. Its water image would appear like a reversed 's' or a flipped 'z' that doesn't align perfectly with the original. (Different)

(C) x: Lowercase 'x' has both vertical and horizontal symmetry. When reflected across a horizontal line, the top and bottom portions swap perfectly, leaving the appearance unchanged. (Identical)

(D) o: Lowercase 'o' is a circle/oval with perfect horizontal symmetry. Its water image is exactly the same as the letter itself. (Identical)