Use the figure to answer the question. 
Refer to the metabolic pathway illustrated. If I, II, III, and IV are all required for growth, a bacterial strain that does not make enzyme X would be able to grow on medium supplemented with which of the following nutrient(s) ?
Definitions:
Markdowns
Reductions in the selling price of goods, often to clear old stock or respond to reduced demand.
Complementary Products
Products that enhance the use of a primary product or are better used in conjunction with the primary product, increasing customer satisfaction and sales opportunities.
Maintained Markup
The practice of keeping the difference between the cost price and selling price consistent across products or over time.
Original Markup
The initial amount added to the cost price of goods to determine their selling price.
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