Depth of field is too shallow, causing too much of the image to be out of focus. The composition is messy and cropped too close with none of the cookies completely in the frame.
In addition to what @Jill_C said: you have a lot of noise, which lets me think that have corrected the exposure substantially.
Furthermore, the grey plate and the grey background don't make a harmonic picture.
If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html