Like adjectives, adverbs with one syllable form the by adding -er to the positive.

Comparative

Explanation:

 The way to form the comparative of single-syllable adverbs is, like with the adjectives, by adding -er to the positive and "than" before the part being compared. "They arrived earlier than I expected." Attention : it is important to note that the adverb early changes the y for i : earlier.  For the superlative also; it becomes earliest

most likely the answer would be a.) cupidity

definitions:

cupidity - greed for money or possessions

hydrophobia - extreme or irrational fear of water, especially as a symptom of rabies in humans

pathology - the science of the causes and effects of diseases, especially the branch of medicine that deals with the laboratory examination of samples of body tissue for diagnostic or forensic

patho -   relating to disease