SOLID [D] - Wrong implementation with high coupling

solid-D-wrong2.cs

public class CreditCard
{
  public bool Pay(int amount)
  {
    // do something
  }  
}

public class Person
{
  public CreditCard CreditCard { get; set; }

  public Person()
  {
    this.CreditCard = new CreditCard();
  }
}

// calling

Person person = new Person();

person.CreditCard.Pay(100);