Someone makes the claim that multicellularity is a monophyletic trait. Which of the following would be evidence that suggests the contrary?

A) Fossil records showing a gradual transition from unicellular to multicellular organisms.
B) Genetic analysis indicating a common ancestry for all multicellular organisms.
C) Presence of similar cell adhesion molecules in diverse multicellular organisms.
D) Identification of a single gene responsible for multicellularity across different lineages.