Which of these fits gap (iii)?

Directions: Complete this passage by choosing the most suitable word/phrase from each list to fit the corresponding gap.

Fanny, the farm dog was pretty smart, but (i)_____ day she got the shock of her life as no one had ever told her about mirrors. As a special treat, she was (ii)______ a big bone. She took it down to  the river bank to enjoy it in peace. As she stood there with the bone in her mouth, she looked at (iii)___ reflection in the water. And what did she see? (iv)_____ dog with a bone in its mouth! She wanted the other bone as well as her own, so she opened her mouth to bark and her bone fell straight in and sank to the bottom.