In a biology class, students are asked to determine the most likely evolutionary relationship between four species based on their genetic markers. Which of the following options represents the most likely phylogenetic tree?

Tree showing Species A and B as closest relatives, then branching to Species C and D

Tree with all species equally distant from each other

Tree showing Species C and D as closest relatives, then branching separately to Species A and B

Linear arrangement with Species A leading to B, then C, ending in D