Sympatric speciation involves reproductive isolation of dispersed populations. is common in plants since many plant species can reproduce by self-fertilization. is often associated with polyploidy in animals. can result from the generation of fertile triploid plants. results only from the generation of allopolyploids.

The correct answer will be - is common in plants since many plant species can reproduce by self-fertilization

Explanation:

Sympatric speciation is a mechanism of speciation which occurs when the population of species inhabiting a particular habitat becomes reproductively isolated from each other.

The offsprings with a high number of chromosomes cannot mate offspring with normal numbers thus are isolated reproductively and form new species.

The most common phenomenon of speciation is known as "polyploidy" in which offspring are produced with high chromosome number than normal chromosomes like tetraploid or hexaploid.

The sympatric speciation is a rare mechanism which is common in plants compared to animals. The process is common in plants as plants can reproduce by self-fertilization which is rare in animals as animals of the opposite sex has to find the mate with same ploidy level.

Thus, the selected option is the correct answer.