50 POINTS BRAINLIEST GIVEN NEED HELP URGENT TIMEDI'm trying my best but i can't get step 7 chem virtual lab boyles law! So plss if anyone knows it pls help! i would really apriciate all the answers for this step but if u only know this one that's okay

Iknow the answer is a but i don't know why

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

What is impossible to do with a hypothesis