Final answer:
The integer that represents depositing $145 in your savings account is +145. Therefore, the correct option is C.
Step-by-step explanation:
The integer that represents depositing $145 in your savings account is +145. In this situation, positive integers are used to represent increases or additions. Since you are depositing money into your account, the amount is increasing, so a positive integer is appropriate.
Depositing $145 into a savings account is represented by the positive integer +145, as it increases the account's balance. Therefore, the correct option is C.