The Korean are __________ than the American in addressing their bosses.
the most formal
Correct answer: A
The Koreans are more formal than Americans in addressing their boss.
Consider the answers:
A. more formal → Comparative structure: more + adj/adv + than (for short and long adjectives/adverbs)
B. formal → There is “coal” so this is a comparative.
C. most formal → Missing article “the”
D. the most formal → There is “than” so this is a comparative, not a superlative