Correct Option: C

joy (Noun) : a feeling of great happiness; delight
ecstasy (Noun) : a feeling or state of very great happiness
economy (Noun) : the relationship between production, trade and supply of money in a particular country or region
eclipse (Noun) : an occasion when the moon passes between the earth and the sun so that you may not see all or part of the sun for a time or when the earth passes between the moon and the sun so that you may not see all or part of the moon for a time
extremism (Noun) : political, religious, etc. ideas or actions that are extreme and not normal, reasonable or acceptable to most people