Final answer:
Unable to provide a definitive answer to the surface area of the composite solid without the specific dimensions of the isosceles triangular prisms.
Step-by-step explanation:
The given problem asks for the surface area of a composite solid made by joining two isosceles triangular prisms at their bases. To calculate the surface area of the composite figure, you would need to know the dimensions of the triangular prisms, including the lengths of their bases and sides, as well as their heights. Without this information, we cannot provide a definitive answer from the choices given, i.e. (a) 104 square units, (b) 122 square units, (c) 158 square units, or (d) 208 square units. It's important in such geometry problems to have all necessary measurements to calculate the surface area effectively.
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