While walking in the woods, you see an organism whose body is divided into two segments and has eight legs and fangs. the organism does not have wings or antennae. in which subphylum would you place this organism? . a. uniramia. b. crustacea. c. chelicerata

First, we can cancel out uniramia. Uniramia are known to have antennae.
We can also cancel out crustaceans. They have more than 8 legs, fang-less and like unimaria, they have antennae. 
The answer would have to be Chelicerata. They do not have any antennae, they have fangs as well as 8 legs. Spiders are perfect examples.