Fill in the blanks choosing appropriate word/ words from those given in the brackets : (gravity separation, magnetic separation, absence, presence, `CuFeS_2`, `Cu_2S`, froth flotation, aluminium, iron, smelting, pure, impure, mines, copper, silver, sulfide, zinc, chromium nickel, tin, blister copper, Cus, Fes, thermal, electrical, argentite or silver glance `(Ag_2S)`, cuprous oxide, cuprous sulfide.)
The process of reduction of metal oxides with carbon is called.........

Explanation

**Step-by-step Solution:**

1. **Understanding the Question**: The question asks for the term that describes the process of reducing metal oxides using carbon.

2. **Identifying Relevant Terms**: From the options provided, we need to find a term that relates to the reduction of metal oxides. The options include terms like "smelting," "gravity separation," "magnetic separation," etc.

3. **Defining Smelting**: Smelting is a process that involves the extraction of metal from its ore by heating and melting. It typically involves the reduction of metal oxides with carbon (usually in the form of coke) at high temperatures.

...