Which of the following is not an opinion?

1. learning to read is easy.
2. anyone can write a novel.
3. an airplane is the best method of travel.
4. blue is my favorite color.

I think an airplane is the best method of travel is not an opinion.

answer: i feel like it would be group discussion

explanation:

the answer is subjective. i personally agree with the first answer for this question.

if one isn't strictly talking about objects then the correct answer would be 'my eyes' since according to this riddle i am asleep and in order to answer/open the door i need to open my eyes first of all.

however, if one is specifically looking for an object, then the first thing i would open would be the door

hope this !