Sum up cells when option selected

Hello, could someone help me with creating a formula? I'm not sure if i should use COUNTIF or some logical function.

Column C has numbers and column D dropdown menu with a few options. I want to sum up to some other cell the numbers of column C, but only if a specific option is selected in column D.

Example:

COL CCOL D
5

New

7

Reused

3

Reused

2

New

7

Reused

So i want to sum all the numbers in Col C only if "New" is shown in corresponding cell of Col D.


Thanks!