Jute fiber is obtained from the jute plant.

Explanation:

Jute fiber is obtained from the stem of a jute plant.

Jute is also called the golden fiber which is a biodegradable substance.

The jute fiber is extracted from the stem of a jute plant by the process of:

Retting = To soap bundles of jute plants in slow running water.

Stripping = Separating non-fibrous substance from the fibrous substance.

Picking = During this process jute fibers are obtained from the stem of the jute plant.

Final Answer:

Hence, the correct answer is option D: stem.