Evaluate Assertion (A):

Sucrose is made up of two monosaccharide units: glucose and fructose. Hence, it is a disaccharide.

Also, sucrose is a non-reducing sugar because the glycosidic bond involves the anomeric carbon of both glucose and fructose, so no free aldehydic/ketonic group is available for reduction reactions.

Therefore, Assertion (A) is true.

Evaluate Reason (R):

In sucrose, the glycosidic linkage is between:

• $C_1$ of $\alpha$-D-glucose and
• $C_2$ of $\beta$-D-fructose

It is written as: $\alpha\text{-D-glucopyranosyl}-(1\to 2)-\beta\text{-D-fructofuranoside}$

But the reason states that sucrose has linkage between $C_1$ of $\beta$-glucose and $C_2$ of $\alpha$-fructose, which is incorrect.

Therefore, Reason (R) is false.

Choose the correct option:

• Assertion is true
• Reason is false

Hence, the correct option is: $\boxed{\text{C}}$

Comparison with stored correct answer:

Stored correct answer = C

My derived answer = C

So, they agree.