Final answer:
The substance is likely a metal, located on the left or middle of the periodic table because of its high malleability and shiny luster.
Step-by-step explanation:
If a substance is highly malleable and has a shiny luster, it is characteristic of being a metal. Metals, as described in the periodic table, are typically shiny, conduct electricity and heat well, and are malleable and ductile. Therefore, the best explanation for the probable position of the substance is option c. Left or middle of the table because it is a metal. Metals occupy the left and center portions of the periodic table, while nonmetals are found in the upper right corner, and metalloids (or semimetals) are found along the diagonal dividing line between metals and nonmetals.