Which option has the incorrect or inappropriate usage of 'further/farther'?
- AThe politician was so flustered by the animosity of the crowd that he refused to answer further questions.
- BI live farther away from college than all my classmates.
- CIf you need to farther your career, you should avoid all kinds of distractions.
- DWe need to discuss this problem right away and avoid letting it fester any further.