Humans have two sets of homologous chromosomes, so humans are usually diploids, but some organisms can have three or more sets of homologous chromosomes, and that is what we call polyploidy.
Polyploid commonly happens due to abnormal cell division, where the chromosomes fail to separate, or it can be caused by chemical substances.
Polyploid is very common in plants, while most animals are diploids and produce haploid gametes. This is because plants have a different life cycle, and also because self-fertilization commonly happens.
In plants, polyploid is responsible for a good percentage of the speciation events, where the new species has a higher ploidy than the original ones. The fact that there are more copies of certain genes can give adaptive advantages, which promotes rapid speciation.
Most of the polyploid species are the result of sexual reproduction, with an even number of chromosomes, however, there are some triploid species that can only reproduce asexually.
This means C, it can happen fast would be the right option.