The correct answer is C: glucose.

In Mucor or Rhizopus, which are types of fungi (specifically, zygomycetes), carbohydrates are absorbed primarily in the form of glucose. These fungi secrete enzymes that break down complex carbohydrates (like starch and cellulose) into simpler sugars such as glucose, which they then absorb for metabolism.

- Option A: Starch is a polysaccharide, and Mucor/Rhizopus doesn't absorb starch directly; they break it down into simpler sugars.
- Option B: Sucrose is a disaccharide, and while it can be used by fungi after hydrolysis into glucose and fructose, the primary sugar absorbed is glucose.
- Option D: Glycogen is stored in animals and fungi but is not the primary carbohydrate absorbed by Mucor/Rhizopus.
- Option E: Arabinose is a monosaccharide but not typically the primary carbohydrate absorbed by these fungi.

Therefore, glucose (C) is the correct form of carbohydrate absorbed by Mucor and Rhizopus.