An ambiguous reference means that it's vague, and it leaves the reader unsure. this often occurs when a pronounce is set after two or more subjects that it COULD apply to, but the reader isn't sure. your answer is choice 1.
The answer is A. Implied. cause its asking a question not stating facts.
this is a big answer u must give more points for people to answer this ;)
Answer:
1) I had the bike checked by my brother before I bought it.
2) The wildlife documentary captured the attention of both children and adults.
3) The bands new album will have been released by the end of the year.
4) Do you feel like having a meal out tonight?
5) Jake was the only person who signed up for the workshop.
6) There was a wide range of restaurants in the city.