Answer: depending on the type of chromosomes a and b could be pericentric and paracentric inversions
C. Tandem duplication
D. Reverse tandem duplicate
E. Deletion
Explanation:
In an acrocentric chromosome, a is a type of paracentric inversion which does not involve the centromeres while b is a form of pericentric inversion which involves the centromere. Doubling a particular segment on the chromosome refers to a tandem duplication. Removal of a segment indicate deletion.