Concept:Jus sanguinis is the legal principle that grants citizenship through blood relationship with one’s parents.Explanation:The term “jus sanguinis” means “right of blood”.It links citizenship to the nationality or citizenship of one or both parents.This is different from jus soli, which grants citizenship based on place of birth.Ethnic background or length of residency is not the deciding factor under this principle.Hence, citizenship is inherited by descent from the child’s parents.Answer:A. parental citizenship