Pick out the correct [er] sound by choosing right spelling

The correct answer is: Winter

The correct answer is "winter".
Among the given options, all the three words include the concluding sound "r" but only the word "winter" has the vowel sound "e" immediately before the "r" and there is no other sound in between. So, the correct answer is "winter" due to the presence of the consecutive sounds "e" and "r".