The author's speculation about the appropriateness of models using spheres of two sizes for binary alloys would be strongly supported if models using spheres of two sizes yielded A. values for density identical to values yielded by one-sphere models using the smaller spheres only B. values for density agreeing nearly perfectly with experimentally determined values C. values for density agreeing nearly perfectly with values yielded by models using spheres of three sizes D. significantly different values for density depending on the size ratio between the two kinds of spheres used E. the same values for density as the values for appropriately chosen models that use only medium-sized spheres