Materials that can be drawn into wires are called ductile. Which of the following is not used as ductile material? 

We are aware that some characteristics of elements make them into metals and nonmetals; therefore, metals are those elements that are malleable, ductile, sonorous, and effective heat- and electricity-conductors. Nonmetal, on the other hand, refers to substances that are neither malleable, ductile, or good conductors of heat or electricity. We shall talk about the differences between two nonmetals and the qualities of metals.

Another very well-liked metal is silver. Silver is a precious metal with a high value that is exchanged in a market comparable to that of gold. Due to its scarcity and molecular valence, silver is a popular metal for jewelry making. Despite needing to be combined with mercury because it is not as malleable as gold, silver has been used in dentistry for a while. When galvanizing, gold makes a suitable conductor to utilize. It is used as a catalyst in the production of batteries.
Soft metal silver has a high thermal and electrical conductivity. It is ductile and malleable like gold. However, the amount of silver in the ore mined in India is only around 1, and it is a byproduct of the lead-gold mining process. Thus, drawing silver to make wire for the industry is quite costly.

Hence the correct option is (C).