Answer:
Well, I can't quite determine if you mean for this to be a trick question or if you are serious.
I say that because technically speaking, A and C show future tense, while B and D show past tense.
Of all the options, A is the best one to represent the present tense. While it certainly <u><em>can</em></u> represent the present tense, it does a much better job at representing the future tense. Yes, really. Let me give you some other examples so you'll see what I mean.....
Explanation:
Today, I'm leaving for Paris on the 4:00 p.m. flight. = future tense
Today, the army is sending me to boot camp. = future tense
.......................
I should add....
If you were to say: "Today, I'm babysitting my nephew." --- <u><em>and you said it at the moment that you are in the house next to your nephew</em></u> -- then, THAT would be present tense.
In this example, we're talking about an action that is happening at the moment of speaking unlike option A above which refers to an action that hasn't happened yet.
Have you got it??
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They both belong to a different phyla
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>