The best answer is C - to break down food into nutrients.
The digestive system breaks down food into its simplest form that cell are able to utilize for energy. Food is broken down into its monomer units. Proteins are broken down into amino acids, lipids are broken down into fatty acids and glycerol and carbohydrates are broken down into glucose.
Glucose is then absorbed into the blood and transported to every cell in the body. The cells take in glucose and use it as fuel and raw material in the process of cellular respiration. From one molecule of glucose, 36 to 38 molecules of ATP ( the form of energy used by cells) are produced.
Maltose is produced instantly when amylase reacts with starch.
Starch is a polysaccharide molecule made of glucose units. The chemical formula of the starch is written as (C₆H₁₀O₅)ₙ. The starch consists of amylose and amylopectin. The glucose units in this starch are linked with the help of two kinds of bonds α 1,4 glycosidic linkages and α 1,6 glycosidic linkages.
This starch molecule is first hydrolyzed into shorter polysaccharides, dextrins, and maltose with a help of an enzyme called amylase. The maltose can be further hydrolyzed into glucose units with the help of the maltase enzyme.
Therefore, the blank can be filled with maltose.
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Light waves or gravitational waves sorry if not correct