Marge Simpson's sisters are Patty and Selma Bouvier. The correct answer is that Selma is the eldest one. In The Simpsons series, it's established that Selma is the older sister and Patty is the younger (though they are twins, Selma was born first). The options with Thelma and Wilma are incorrect names, and option C gets the birth order wrong (Patty is not the elder).