Select the option that rectifies the spelling error in the given sentence.
The phone rang, but nobody awnsered.

The correct option is answered.

Step-by-step Explanation:
1. Identify the misspelled word: In the sentence, "The phone rang, but nobody awnsered," the word "awnsered" is misspelled due to a transposition of letters and phonetics.
2. Understand the base word: The base verb is "answer" (spelled A-N-S-W-E-R). The misspelling "awnser" swaps the positions of the letters 's' and 'w'.
3. Form the past tense: Since the action occurred in the past (indicated by "rang"), the past tense suffix "-ed" is added to the base verb "answer", resulting in answered.
4. Analyze the options:
• "awmsered" contains incorrect letters ('w' and 'm').
• "ansvered" incorrectly uses a 'v' instead of 'w'.
• "answorod" uses incorrect vowels ('o').
• "answered" is the correct and standard spelling of the word.