The answer to this question is explained in the second sentence of the second paragraph. The option that states \u201CBecause it is more beautiful\u201D can be eliminated, as the passage implies that both dogwood trees are beautiful. The option that states \u201CBecause it flowers after leafing\u201D can also be eliminated. Even though the statement is true, it does not represent why the kousa dogwood is a better option, because both trees flower. The option \u201CBecause it is available at garden centers\u201D could be a good option, but the passage doesn\u2019t imply that the flowering dogwood is hard to find; therefore, this option can also be eliminated.