Answer:
The farmers are impressed with how well the farm is run.
The farmers vow to implement the same kinds of systems.
Explanation:
The sentence that combines the two sentences using a present participial phrase is B) Stretching eight feet, the sunflower reaches all the way up to my window.
This is the only sentence where you can find the present participial phrase - <em>stretching eight feet. </em>
Waiting for the sunrise. You really feel an appreciation for the beauty of nature.