Genes described as sex-linked are located:
a. on the y chromosome
b. on the x chromosome
c. on all autosomal (non-sex) chromosomes
d. only in the cells of females
e. only in the cells of males

b. on the X chromosome  

Explanation:

Sex-linked genes refer to genes located on sex chromosomes that are involved in determining traits. In humans, the male sex chromosome Y has few sex-linked genes. Already, the female sex chromosome X has a large amount of genes involved in determining various gender-related characteristics, so it has become usual to determine that the genes described as sex-linked are located on the x-chromosome.

answer: no, they are not.*

although rubber bands that contain excessive amounts of dye, toxins, or additives are sometimes toxic, most rubber bands do not cause any health issues. since they are typically made of latex, (a natural substance that is extracted from trees) they are not dangerous in any way if you chew them or accidentally ingest a piece of rubber band. however, chewing rubber bands does pose a choking hazard and is not a good habit to have.

*depending on the type of rubber band. the typical rubber bands that you see at stores are not toxic, but other types of rubber or latex that contains certain chemicals may be unhealthy and hazardous.