Final answer:
The word 'simian' does not naturally convert to an adverb form in English, and none of the provided options are correct adverbial forms of 'simian'.
Step-by-step explanation:
The word simian refers to monkeys or apes. When converting adjectives to adverbs, most commonly, we add the suffix -ly to the end of the adjective. However, not all adjectives convert to adverbs as neatly, and some don't at all. The term simian doesn't naturally convert to an adverb in standard English by adding -ly or any other typical adverbial suffix such as -ously, -like, or -esque. Therefore, out of the provided options, none would be a correct adverbial form of simian. In English, we would have to rephrase the sentence to avoid needing an adverb form of simian, perhaps by saying 'in a simian manner' or using a different adverb entirely.