Finish the following sentence with the best choice: How do you make a buttermilk substitute for pancakes?

Choices:
- To make a buttermilk substitute, take one cup of milk and empty out one tablespoon of it. Replace the tablespoon of milk with a tablespoon of white vinegar, and leave for twenty minutes.
- To make a buttermilk substitute, take one cup of milk and empty out one cup of it. Replace the tablespoon of milk with a tablespoon of white vinegar, and leave for twenty minutes.

Answer:
To make a buttermilk substitute, take one cup of milk and empty out one tablespoon of it. Replace the tablespoon of milk with a tablespoon of white vinegar, and leave for twenty minutes.