Question: In a certain code language, 'speak nicely to all' is coded as 'ka cu ma he', 'all are like us' is coded as 'si fo he to', 'teach us lesson nicely' is coded as 'po ma fo re', 'lesson like all humans' is coded as 'he re gu si'.
Options:
A. si
B. to
C. fo
D. Either A or B
E. Can't be determined
Answer: B