Context: I volunteer with a student who is taking the CELPIP exam in Canada. In this exam they give a survey with two options (option A and option B). The student has to choose an option and say why he/she thinks it's the best.
My student wrote the following:
I think the option A is the best because ... (sounds wrong to me)
As a native speaker, I suggested that he use either of the following:
- I think that option A is the best because...
- I think option A is the best because...
My question is why do we use “that” or no article before "option A"?
Also, why can we say “I think that the best option” or “I think the second option is the best”?