Final answer:
An adverb modifies or describes a verb, adjective, or other adverb. 'Olento' and 'O' are not adverbs.
Step-by-step explanation:
An adverb is a word that modifies or describes a verb, adjective, or other adverb. It usually answers questions like how, when, where, or to what extent. In the provided options, 'Olento' and 'O' are not adverbs because they do not describe verbs, adjectives, or other adverbs. 'O mal' and 'O bastante' are both adverbs that mean 'badly' and 'enough' respectively. 'Contentamente' is also an adverb which means 'happily'.
Learn more about Adverbs