Step 1: Understand sugarcane propagation.
Sugarcane is primarily propagated by vegetative methods, particularly through cuttings rather than seeds.
Step 2: Review the options.
- Tubers are typically used for propagating plants like potatoes, not sugarcane.
- Cutting of stems is a common method for sugarcane propagation, where a piece of the stem is planted to grow a new plant.
- Bulbs are used in plants like onions or garlic, not sugarcane.
- Seeds are not used in sugarcane propagation, as sugarcane is primarily propagated through stem cuttings.
Step 3: Conclude.
The correct method of propagating sugarcane is by cutting of stems, making option (B) the correct answer.
Final Answer:
\[
\boxed{\text{Cutting of stems}}
\]