One wonders if we're speaking of deep fried chicken or margarine. In one case the oil is part of a process and only a small portion of it would be consumed. In the other, the oil is an integral part of the product.
(These days, transfats are the bigger issue, which may or may not be part of 100% vegetable oil.)
They have tricky ways to confuse you. In the first one, picture a shelf with all the ingredients in containers. One of them is marked, "100% vegetable oil." It's used when they make all their products. What else do they use? Lard, perhaps? Do they use it as an ingredient or in the deep fryer?
Number two says "prepared in" so you know it's a deep fryer. Likewise number three - made in, not made with. "Prepared" (#2) makes it sound like they worked harder than "made" (#3).