Final answer:
The German botanist from the 1800s in the given choices is Gregor Mendel (C), who was actually Austrian and performed significant work in genetics. Carl Linnaeus was Swedish, not German, and was active in the 1700s.
Step-by-step explanation:
The name of the German botanist from the 1800s mentioned in the question options is Johann Gregor Mendel. However, if we are to correct the typo as Mendel was not German but Austrian, the best fit for the actual question would be (C) Gregor Mendel. Johann Gregor Mendel was a scientist known for his foundational work in the field of genetics, particularly for his experiments with pea plants that led to the formulation of Mendel's laws of inheritance.
Despite the options provided in the question, it is important to note that Carl Linnaeus, although a pioneering botanist, was not German but Swedish, and his crucial work on taxonomy and nomenclature dates back to the 1700s.