Answer:
i think it is d, it makes more sense to me
<span>a. the writer s attitude on the subject</span>
The plural form of the word radius is <em>radii</em>.
I know it sounds weird, but this is correct. Adding <em>-s </em> at the end of the radius would make the word grammatically incorrect. This is because the word radius itself is a Latin word.
- Marlon Nunez
I think because is your best option.