Answer A is written incorrectly because obstinacy means to be stubborn and if you put that in the sentence, it makes no sense.
The word said is less precise
whispered is more precise
eamed is precise
made is less precise
outgoing is more precise
nice is less precise
home is less precise
mansion is more precise
Yes, texting should be made more expensive so people are not in danger of losing their reading skills, but also there are multiple others reasons it should be made more expensive.
1) Because people spend too much time texting and on screens.
2) People spend too much time communicating with their peers through screens rather than in real life.
3) People will be tempted to text all day and night if it continues to be cheap.
The answer is:
C. She's determined not to try