Final answer:
The correct percentage that is equal to 0.45 is 4.5%.
Step-by-step explanation:
The correct percentage that is equal to 0.45 is option C: 4.5%
To understand why, let's look at how percentages are calculated. Percentages are a way to represent a part of a whole as a fraction out of 100. So when we want to calculate a percentage, we divide the given value by the total value and multiply by 100.
In this case, 0.45 is the given value, and we want to find the equivalent percentage. So we divide 0.45 by the total value, which is 1, and multiply by 100. This gives us 45%. Therefore, option C, 4.5%, is the correct percentage equivalent to 0.45.