‘col tip mot’ means ‘singing is appreciable.’
‘mot baj min’ means ‘dancing is good.’
‘tip nop baj’ means ‘singing and dancing.’
⇒ ‘mot’ is common in both ‘col tip mot’ (singing is appreciable) and ‘mot baj min’ (dancing is good), so ‘mot’ likely represents ‘is.’
⇒ ‘baj’ is common in ‘mot baj min’ (dancing is good) and ‘tip nop baj’ (singing and dancing), so ‘baj’ likely represents ‘dancing.’
This leaves ‘min’ in ‘mot baj min’ (dancing is good) to represent ‘good.’ Thus, the word for ‘good’ is ‘min.’
So, the correct option is (B): min.