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Math·Algebra·Linear functions

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Harper deposited a fixed amount into her bank account each month. The function $f(t)=400+30t$ gives the amount, in dollars, in Harper’s bank account after $t$ monthly deposits. What is the best interpretation of $30$ in this context?

A

With each monthly deposit, the amount in Harper’s bank account increased by $30.

B

Before Harper made any monthly deposits, the amount in her bank account was $30.

C

After 1 monthly deposit, the amount in Harper’s bank account was $30.

D

Harper made a total of 30 monthly deposits.