Why have these photos been rejected?

B4A6790.jpg - I can't find anything in focus in this image

B4A6797.jpg - noise and chromatic aberration

B4A6792.jpg - underexposed in the shadows 

The shadows could be opened up.

I looked at the first photo and this is what I see.

This type of landscape should not be in a rectangular format. Use a landsacape format. Such as 3:1. Your photo is overexposed and there are no blacks. Use the histogram. The highlighted areas are overexposed and there are no details. These areas need to be filled in. The colors are undersaturated.
Here an example to show you what I mean.

Definitely, it is this soft focus that makes this asset unsuitable for stock.

Even as you have some clipping in the whites that could be nicely addressed, I am not convinced that this was the deciding reason for the refusal. I also would think that you used a tripod, as B4A6759 shows a shutter speed of 3.2 s. I would guess that hand-held shooting would result in much worse camera shake. That lets me think that the autofocus did not work as it should or as you intended.

With B4A6790, you also have a hot pixel to correct, and some noise in the background:

Have you checked the images at 100%?

It looks like some of the photos have blur caused by camera movement,

small aperture blur caused by stopping down the lens too much,

or are out of focus.

You will remove these photos before posting.

Focus, it seems you used a slow shutter speed to get the soft wave action, but this has also resulted in not a sharp photo:

Signs of camera shake.

Also, the sun: overexposed area - a bit too much:

Throughout the photos, the images are not sharp.

Did you hand-hold these shots, or did you use a tripod?

Your EXIF data shows a shutter speed of 1/13sec.

I've forgotten to say that the reason of rejection is quality problems