Which statement about trans fatty acids is true?
a. they have a beneficial effect on cholesterol transport throughout the body.
b. their amounts are never listed on food labels.
c. they arise when polyunsaturated oils are hydrogenated.
d. they occur naturally in foods to a large extent.
e. they are made by the body.

Option C, They arise when polyunsaturated oils are hydrogenated.

Explanation:

Polyunsaturated oils which are partially hydrogenated consists of trans fat in large amount. Trans fat is not at all good for health. It raises the bad cholestrol (LDL) and decreases the good cholestrol (HDL). They are responsible for causing diabetes of type 2.

However, when Polyunsaturated oils  are fully hydrogenated they do not contain any trans fat as they have converted into saturated fats such as stearic acid

But, overall Trans fatty acid arises only when polyunsaturated oils are hydrogenated (partially).

Thus, option C is correct.

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