While hiking in Costa Rica, Bert discovers a new species of arthropod. Which characteristics should he look at to determine in which group it belongs?

plez help

Arthropod, any member of the phylum Arthropoda, the largest phylum in the animal kingdom, which includes such close forms as lobsters, crabs, spiders, mites, insects, centipedes, and millipedes. About 84 percent of all known species of animals are members of this phylum.

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /

i believe the answer would be b. hope it : )