Which of the following types of coal requires the most intense pressure in order to form?

Coal is ranked into four types depending on its carbon content. They are lignite, sub-bituminous, bituminous and anthracite. It is anthracite which has the highest carbon content thus the type of coal that needs more pressure to form. Also, it has the highest carbon content. 

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na