Help pleas s

 B and C

Step-by-step explanation:There are more then one way to write a ratio which are colon ,fraction ,and using to like for example (5 to 6).

And now it says students that like chcocolate icecream to  students that like vanilla icecream .And 20 people like chcocolate icecream while 6 people like vanilla icecream .So both choice b and c says 20 first and then 6 next.

Hope it helps :)

a

step-by-step explanation:

strong negative correlation