What are alkali metals

Alkali metals are highly reactive elements that appear to be silver and they are found in group 1 of the periodic table.  It consists of lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).  As you go further down the group, the more reactive they are.  Those elements all react to water and air, so they must be kept in oil to preserve their state.  

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

they are made of gases.

they have a spherical shape.

they make energy through fusion.