Ashanti has been acting for α years, and Diana has been acting for d years. If Ashanti has been acting for 1.5 times as long as Diana has, which is also 4 years longer than Diana has been acting, which of the following systems of equations correctly models this situation?

A. a=1.5d A
a=d+4

B. a=1.5d
d=a+4
d=1.5a