In tissue engineering, scaffolds are built for growing replacement body parts primarily so that:
a. stem cells are accepted by the body
b. cells grow into the correct shape
c. tissue is more durable
d. this device does not need an external power source

Option B

Explanation: In case of tissue engineering, scaffolds are built for growing replacement body parts. This is done to provide a proper shape for the growth of the cells.

The cells in the body needs to grow in a proper shape and size means it should in the affected area only.

This will result in on time growth and development of the affected area as scaffold will provide a base for the growth of cells in proper shape.