Plz fast. i don"t want to do summer

which represents a deletion of a section of the dna shown here?

a—c—t—g—g—a—t

a.

a—c—t—a—t

b.

a—c—t—c—c—t—t

c.

a—c—t—c—g—a—t

d.

a—t—c—t—g—g—a—t