Final answer:
To express a ratio in fraction form, write the numbers in the ratio as a fraction. To express a ratio in simplest fraction form, simplify the fraction.
Step-by-step explanation:
To choose the answer that correctly expresses a ratio in fraction form, we need to write the two numbers in the ratio as a fraction. For the ratio 36:54, the fraction form is 36/54, which can be simplified to 2/3.
To choose the answer that correctly expresses a ratio in simplest fraction form, we need to simplify the fraction. For the ratio 25 to 50, the simplified fraction is 1/2.