Photos going to dropbox instead of iphoto?

Since my sister downloaded Dropbox on my Mac, whenever I connect my iphone to my Mac, it automatically transfers the photos to dropbox instead of iphoto. It just won't upload it to iphoto. What happened?

Do this in OS 10.9.1…
- Open iPhoto.
- Go to the top menu bar, iPhoto > Preferences.
- Select the "General" tab.
- At the drop list for "Connecting camera opens", choose "iPhoto".

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