Diploid refers to a cell that has two copies of each chromosome. One way that a diploid organism could have an offspring that are 3n (triploid) or 4n is when the chromosomes don't separate during meiosis.
Triploid refers to some cell that have 3 copies of each chromosomes for a total of 69 chromosomes.
A. Atoms with an ironic bonds
The answer is C. Chromsomes make up part of the DNA and carry the information needed to code for the DNA's proteins.