Which answer is it? Can anyone explain it to me?

Answer:
D. 1:1
Step-by-step explanation:
The ratio between boys to girls is -
19 : 19
You can simplify that and it would become -
1 : 1
Answer:
19:1
Step-by-step explanation:
I think so because I believe if there are 19 in each "group" there's 19 people then there another group of 19 so I believe it would be 19:1