This phylogenetic tree was constructed by comparing sequences for a homologous gene involved in development. Select the correct statement. A phylogenetic tree containing two main branches for evolutionary relationships among the animals. The first branch leads to Drosophila. The second branch divides into two branches, 2a and 2b. Branch 2a leads to Lancelet. Branch 2b divides into two branches: 3a and 3b. Branch 3a leads to Zebrafish. Branch 3b divides into two branches: 4a and 4b. Branch 4a leads to Frog. Branch 4b divides into two branches: 5a and 5b. Branch 5a leads to Chicken. Branch 5b divides into two branches leading to Human and Mouse, respectively. This phylogenetic tree was constructed by comparing sequences for a homologous gene involved in development. A) The nucleotide sequence of this gene in a mouse is more similar to the sequence in a chicken, and both are less similar to the nucleotide sequence of this gene in a frog. B) The common ancestor of a human and a frog and the common ancestor of a mouse and a chicken lived at the same time. C) A frog is the ancestor of both a mouse and a chicken.