For as long as tansy can remember she has never liked gummi bears. her dislike of gummi bears has been important to her for a long time and she puts time and effort into learning about the ingredients of gummi bears to back up her opinion. this is an example of:

Hi! The answer would be "strong attitude".

Explanation:

The reason why this is an example of strong attitude is because Tansy is going above and beyond to prove that gummi bears are bad. If she weren't she would just stop eating them. But because she has a strong attitude, she will put effort to learn about the ingredients in them to tell people why they are bad.