Paco's cell phone carrier charges him $0.20 for each text message he sends or receives, $0.15 per minute for calls, and a $15 monthly service fee. Paco is trying to keep his bill for the month below $30. Which best describes the possible values of t, the number of texts he can send or receive?
A.t can be any real number where 0 ≤ t < 75.
B.t can be any whole number where 0 ≤ t < 75.
C.t can be any real number where 0 ≤ t < 150.
D.t can be any whole number where 0 ≤ t < 150.