Which of the following is a characteristic feature of geraniums?

Geraniums are well-known for their distinctive flowers, which typically feature vibrant colors such as red, pink, purple, and white, and possess a unique pattern of net-like veins. This characteristic not only contributes to their ornamental appeal but also aids in identification among various flowering plants. The array of colors and the intricately veined petal structure enhance the visual interest and allure of geranium plants, making option B the correct choice in recognizing their defining features.

In contrast, solid triangular stems, longer leaf blades with parallel veins, and closed hard stem joints do not accurately represent the botanical structure or aesthetic qualities associated with geraniums. These characteristics might pertain to other plant types, highlighting the importance of understanding specific traits when identifying different species.