Answer:
a) a plotting object like point, line, or other shape
Explanation:
A geom in the ggplot2 system is "a plotting object like point, line, or other shape."
A Geom is used in formulating different layouts, shapes, or forms of a ggplot2 such as bar charts, scatterplots, and line diagrams.
For example some different types of Geom can be represented as geom_bar(), geom_point(), geom_line() etc.
