Which of the following oils does not contain trans-fats?

The choice of corn oil as the correct answer hinges on the fact that it is a vegetable oil that is naturally free from trans fats. Unlike partially hydrogenated oils, which are a common source of trans fats, corn oil is extracted from corn kernels and does not undergo this chemical process that alters its fat composition.

Trans fats are typically found in certain processed foods and fats that have been hydrogenated to improve shelf life and texture. In contrast, olive oil and soybean oil can also be largely trans-fat-free, but it might vary depending on the processing methods used. Butter, on the other hand, contains small amounts of naturally occurring trans fats, mainly from dairy sources.

By recognizing that corn oil is derived from a natural source without any modification to introduce trans fats, it becomes evident why it stands out as the correct choice in this context.