Context: This passage describes the Marfan syndrome trait in humans:
Marfan syndrome is a condition that affects a protein called fibrillin. Fibrillin helps support many parts of the human body and also affects growth. Humans with Marfan syndrome tend to be taller than average and have long limbs, fingers, and toes. They may also have heart problems and other organ issues.
In a group of humans, some individuals have Marfan syndrome and others do not. In this group, the gene for the Marfan syndrome trait has two alleles. The allele for having Marfan syndrome (M) is dominant over the allele for not having Marfan syndrome (m).
This Punnett square shows a cross between two humans.
What is the expected ratio of offspring that have Marfan syndrome to offspring that do not have Marfan syndrome? Choose the most likely ratio.
A. 2:2
B. 4:0
C. 0:4
D. 1:3
E. 3:1
Choose the right answer from the options and respond with its letter.

B