Context: In a group of guppies, some individuals have a spotted tail and others have an unspotted tail. In this group, the gene for the tail spots trait has two alleles. The allele for a spotted tail (I) is dominant over the allele for an unspotted tail (i).
This Punnett square shows a cross between two guppies.
What is the expected ratio of offspring with a spotted tail to offspring with an unspotted tail? Choose the most likely ratio.
A. 0:4
B. 3:1
C. 4:0
D. 2:2
E. 1:3
Pick the correct answer from the listed options and provide the letter of the selected option.

D