单项选择题
下面代码的输出是什么?（）
function Person(firstName, lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
const lydia = new Person("Lydia", "Hallie");
const sarah = Person("Sarah", "Smith");
console.log(lydia);
console.log(sarah);
A.Person{firstName:"Lydia",lastName:"Hallie"} and undefined
B.Person {firstName: "Lydia", lastName: "Hallie"} and Person {firstName: "Sarah", lastName: "Smith"}
C.Person {firstName: "Lydia", lastName: "Hallie"} and {}
D.Person{firstName:"Lydia",lastName:"Hallie"}and ReferenceError