In a survey of 400 people, 250 said they prefer Product A. What is the sample proportion who prefer Product A?

The sample proportion is the part of the sample with the characteristic divided by the sample size: $\frac{250}{400}=0.625$, choice C. This means $62.5\%$ of the surveyed people prefer Product A. Choice A ($0.375$) is the proportion that do not prefer Product A, $\frac{150}{400}$. Choice B ($0.60$) compares the $150$ who do not prefer it to the $250$ who do, which is a ratio between the groups. Choice D ($1.6$) is $\frac{400}{250}$, which divides in the wrong order. A proportion can never be greater than $1$.