Which of the following are used in the production of smartphones? Select the three correct a answers. Calcite, lithium, silicon, colbalt, alunite, or halite

silicon, cobalt

Explanation:

For the production of mobile phones following are made use of Alumina, Silica, Graphite, Manganese, Aluminium. Of which 25% constitutes the silicon, 23 % plastic, 20.4% iron, and aluminum 14.17 %. Other elements include copper, gold, silver, lithium, and cobalt also. Thus about 83 stable elements make the smartphone.

i think it is Substance C