Answer:
The correct answer will be -Genetic mutation.
Step-by-step explanation:
The variation in the organism is caused by the changes in the heredity material of an organism- DNA which contains coding sequences called "genes". These genes control the phenotype traits of the organism by changing the physiology as they code for the enzymes which act as a catalyst.
The changes in the genes will be known as the mutations which get passed on to the offspring and become permanent.
In the given question if a new variety of lobster is produced due to overproduction of protein then it will be the result of the changes that took place in the genes.
Thus, Genetic mutation is the correct answer.