Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

The most accurate description of nominal GDP is:
Option A:a measure of total expenditures at current prices.
Option B:the value of goods and services at constant prices.
Option C:a measure to compare one nation's economy to another.

Answer: A