Cardiology is an adjectival suffix. Thus option C is correct.
what is adjectival suffix ?
An adjective describes noun. Adjective suffixes can be added to verbs and nouns to form an adjective. It can change the root of grammatical function.
Some adjective suffix are nt or -ent which refers to inclined towards something/ someone, such as independent, vacant, important
Similarly -ary suffix which is related quality or place like customary, momentary, cautionary
Third is -able or -ible suffix refers to capable of, tending to such as flammable, discernible, culpable etc.
-al suffix refers to having the quality, like accidental, educational, brutal
historical. Finally -ful suffix related to Full of, tending such as awful, skillful, successful, bountiful
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