Fruitfly has

The correct answer is A. Fruitflies have 4 chromosomes in their somatic cells. The X chromosome is the largest chromosome in the fruitfly genome, followed by the second chromosome, the third chromosome, and the fourth chromosome. The Y chromosome is the smallest chromosome in the fruitfly genome.

Option B is incorrect because fruitflies have 4 chromosomes, not 6.

Option C is incorrect because fruitflies have 4 chromosomes, not 8.

Option D is incorrect because fruitflies have 4 chromosomes, not 10.