All of the following statements are true about carbohydrates except:
a. Plants are the major source of carbohydrates in our diet.
b. All carbohydrates are made up of monosaccharides.
c. Complex carbohydrates include starch, fruit juice, and fiber.
d. Simple carbohydrates include sugars.
e. A diet containing too much simple sugar can be harmful to health.

All carbohydrates are made up of monosaccharides.

Explanation:

The carbohydrates are one of the crucial naturally occurring chemicals when it comes to the survival and prosperity of the living organisms. They serve lot of different roles, from providing energy, storing energy, fertilization, make up the RNA, strengthening the immune system etc.

The carbohydrates though are not all the same, and they can actually be divided into four different groups:

Each of them has different chemical composition, thus having different properties. Those different properties in turn result in different types of usages for each of them among the living organisms. The smallest units, the monosaccharides and disaccharides are actually the ones that are referred to as sugars, something that we all know very well and use it on daily basis.

the answer to your question is:

c. complementary base-pairing