The total number of flowers is the sum of the number of tulips and the number of daffodils.
The number of tulips is 5.
The number of daffodils is 7.
So, the total number of flowers is the sum:
Now, we need to write the part-to-whole ratio to compare tulips to total flowers. This ratio is written as follows:
Therefore, since the number of tulips is 5 and the total number of flowers is 12, that ratio is:
Thus, option C is correct.