I think its b. culture lets the reader know which of the characters’ behaviors are normal and which are unusual
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because, it is easier to use plants or things of that type other than using human trials which can be lethal if done wrong.
Answer: D
Explanation: "less" almost always qualifies as an adjective, because it's describing a noun, that being support, which is a thing/idea.
You would use it as an adverb if you were using it to describe or add more information to a verb. Ex. "I've been trying to work <em>less</em> on the weekends." Work is a verb, so less would qualify as an adverb here.
