What type of mutation causes a change in the number of chromosomes?

Chromosome mutations can result in changes in the number of chromosomes in a  cell  or changes in the structure of a chromosome. Unlike a  gene mutation  which alters a single gene or larger segment of  DNA  on a chromosome, chromosome mutations change and impact the entire chromosome. Key Takeaways: Chromosome Mutations

answer; i believe that the correct answer is(d) nondisjunction during meiosis;

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in