An online music club has a one-time registration fee of $20 and charges $0.50 for each song download. If Ella has $50.00 to join the club and buy songs, which inequality gives the maximum number of songs, s, she can buy?

A) s ≥ 60
B) s ≥ 30
C) s ≤ 30
D) s ≤ 60