The correct answer is option c) Ga
Boron (B) belongs to Group 13 (Group IIIA) of the periodic table, and elements within the same group exhibit similar chemical properties due to their shared valence electron configuration. Among the provided options, **Gallium (Ga)** is chemically similar to boron. Gallium is also a Group 13 element and, like boron, has three valence electrons.
Both boron and gallium share common characteristics such as the ability to form compounds with three covalent bonds. They also exhibit similarities in their reactivity patterns and some physical properties. The resemblance in chemical behavior arises from the fact that elements within the same group tend to have analogous outer electron configurations, influencing their interactions with other elements.
In contrast, the other options (Cl, Si, Ds, Os, Mo, Ti, Li) are not in the same group as boron and have different electron configurations and chemical properties.