Answer: its C 3:2
Step-by-step explanation: see how it has the word AGAINST that means the opposite of the word FAVOR if the Question was. . .
This spinner has 6 equal sections. what are the odds in simplest form FAVOR spinning blue or yellow? then the Answer would be B 2:3 
but sense the Question is. . .
This spinner has 6 equal sections. what are the odds in simplest form AGAINST spinning blue or yellow? 
your Answer is . . .
 C) 3 : 2
Have a wonderful day :D