Four band members, harry, isabel, jose, and karen, are all boarding a bus to attend a concert. in each arrangement below, the first initial of each person’s name represents that person’s position as he or she boards the bus: first, second, third, and fourth. if we know that karen boards the bus first, which shows the possible outcomes for this event?

a=khij
b=khij, khji
c=khij, khji, kjhi, kjih
d=khij, khji, kjhi, kjih, kihj, kijh