What is the explicit rule for the nth term of the geometric sequence? 5, 20, 80, 320, 1,280, …
A. aₙ = 5(4ⁿ- 1)
B. aₙ = 5(4n- 1)
C. aₙ = 4(5ⁿ- 1)
D. aₙ = 5(4ⁿ)