She was wondering whether they've (A) completed their lifeguard training.
You need to add more context to this question, or it won’t get answered
Answer:
Dear Teacher(her/his name)
Explanation:
Your have always helped me when I needed it.
Whenever I had questions you had answers.
Whenever I had doubts you gave reassurance.
I think your a awesome teacher and hope you have fun teaching.
C. the word Have shows you it is past tense but it does not end in ed so it is no a past participle.
