"Nerd" is an informal English word used for a person seen as dull, socially awkward, or overly focused on studies or a narrow interest, often to the point of seeming boring or uninteresting to others in a social setting. The everyday sense of the word centres on this social awkwardness and lack of general appeal, which matches "Uninteresting person".
"Genius" refers to someone with exceptional intellectual ability. While some nerds are intelligent, the word "nerd" itself describes a social type, not a measure of brilliance, so genius is not an accurate match. "Worm" is a literal soft bodied invertebrate creature and has no established connection to the word nerd. "Arthropod" is a scientific classification for creatures like insects and spiders, again unrelated to the social meaning of nerd.
Since the common English usage of "nerd" points to a socially awkward or uninteresting person rather than a measure of intelligence or a biological term, option 2 is correct.