--- are one internode long runners,usually found in rosette plants at the ground/water level.
A. Trailers
B. Offsets
C. Stolons
D. Rhizomes

Hint: In order to deduce a correct answer, try to understand where these structures are found. Do they appear in soil or do they appear below it. Also, try to think about common vegetables and fruits that we mostly consume. For example ginger and strawberry.

Complete answer:
To arrive at the correct answer, we must now each of the definitions of the above-mentioned terms. To begin with, rosette plants are plants that primarily sit on the soil and have a circular arrangement of leaves. Trailers are plants with weak stems that trail horizontally on the ground. A stolon is a creeping horizontal plant stem or runner that takes root at points along its length to form new plants. However, a rhizome is also a stem that may be present below the soil surface. They contain nodes from where future roots and shoots develop. One such example of a rhizome is ginger. Although these structures may look or sound similar, they are certainly not the same. Offsets on the other hand are a part of the stem by which the plant is capable of doing asexual reproduction. It is a means by which vegetative reproduction occurs in plants. Offsets are genetically identical to the parent plant and cells in them divide mitotically.

Thus, the correct answer is option B Offsets.

Note:
Offsets mostly develop in plants that have underground storage organs. They form when meristem regions of plants differentiate to become self-sufficient and independent and hence they form new plants.