Final answer:
Semimetallic substances, or metalloids, would be located along the diagonal line in the periodic table; therefore, in the bond-type triangle, they would be found in a similar diagonal region, which is answer C (left).
So the correct answer is option (C).
Step-by-step explanation:
In addressing the question regarding which region of the bond-type triangle would contain semimetallic substances, we look at their position in the periodic table. Semimetals, also known as metalloids, are located along the diagonal line in the periodic table that separates metals and nonmetals. Therefore, in relation to the bond-type triangle, semimetallic substances would be found along a similar diagonal line if such a triangle were to exist. Hence, semimetals would be represented in the region closest to this demarcation.
As the question provides options A (top), B (bottom), C (left), and D (right), the correct answer would be C (left), since this is where the dividing line would typically run between metals and nonmetals, characterizing the position of semimetals within the periodic table framework.