Answer: OPTIONS C, D and E.
Explanation:
First, it is important to remember the definiton of "Ratio".
A ratio is defined as a comparison between two number numbers "a" and "b" (
).
By definition, a ratio can be expressed in the following forms:
1. In words. This is:

2. In odds notation, as following:

3. In fractional notation. This is:

In this case you know that there are 5 green tiles for every 3 blue tiles in a mosaic.
Then, based on the explained before, the ways you can write the ratio of blue tiles to green tiles, are:
