In this question, we are asked to identify which of the given options is amorphous. Amorphous refers to a substance that does not have a definite crystalline structure.

Let`s examine each option to determine if it is amorphous:

Option 1: Cane sugar - Cane sugar has a definite crystalline structure, which means it does not meet the criteria for being amorphous.

Option 2: Sodium chloride - Sodium chloride, also known as table salt, forms a regular crystalline structure and is not amorphous.

Option 3: Powdered marble - Powdered marble is also known to have a crystalline structure, so it is not amorphous.

Option 4: Glass - Glass is the correct answer as it is amorphous. Unlike crystalline materials, the atoms in glass are arranged randomly, giving it a non-crystalline or amorphous structure.

Therefore, the correct answer is option 4, glass.

Note: It is important to understand that amorphous substances do not have a regular repeating pattern, while crystalline substances do. Glass is a common example of an amorphous material as it lacks long-range order or a well-defined structure.