What determines that an element is a metal?
a. the magnitude of its charge
c. when it is a group a element
b. the molecules that it forms
d. its position in the periodic table

Its position in the periodic table.
An element that readily forms positive ions is called a metal.The arrangement of chemical elements in tabular form where the elements are ordered by their atomic number is called the periodic table. In a periodic table metals are on the left in yellow.

The answer should be c.

Iwould you figure it out but you don't have a picture or in your question as to what the physical property you're looking for is