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On Saturday mornings, Lucy volunteers at the hospital where her mother works. One Saturday, she answers phone calls at the information desk while the receptionist is away. Then she spends $40$ minutes delivering flowers to patients' rooms. In all, Lucy volunteers at the hospital for $90$ minutes that day.$\newline$Which equation can you use to find the amount of time $t$ that Lucy answers phone calls?$\newline$Choices:$\newline$(A) $t - 40 = 90$$\newline$(B) $40t = 90$$\newline$(C) $t/40 = 90$$\newline$(D) $t + 40 = 90$$\newline$Solve this equation for $t$ to find the amount of time that Lucy answers phone calls.$\newline$____ minutes$\newline$