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The question is based on the following text.
To make or manufacture Biodiesel, you must first prepare the raw materials. The raw materials needed in the production of Biodiesel are a small amount of methanol and a ready supply of vegetable product. ( ____ ) The oil is then turned into biodiesel through a process called ester interchange. To complete this process, the vegetable oil has to be combined with a smaller amount of methanol and then put in the presence of a small quantity of an alkaline catalyst (for example, 5% to 1% sodium hydroxide). Vegetable oil is made up of so-called triglycerides, which is a compound of the trivalent alcohol glycerin with three fatty acids. The goal of ester interchange is to separate the glycerin molecule from the three fatty acids and replace it with three methanol molecules. This process then yields roughly 90% Biodiesel and 10% of a glycerin byproduct. The glycerin byproduct can be used in a number of other chemical processes for different industries.
The correct sentence to fill in the blank and make a meaningful paragraph is ...
The first step is to use the raw vegetable product to make vegetable oil.
Vegetable oils are oils extracted from seeds, or less often, from other parts of fruits.
Homemade vegetable oils are fresher and more flavorful than store-bought oils.
Oils extracted from plants have been used since ancient times and in many cultures.
The machine to produce vegetable oils with little to no heat is called cold-presses.
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