The present is the key to the pats because what you have done in the past is what has now brought you to where you are now, it was the stepping stones
I would go with A because its the only one that makes since. The pencil would have to fall eventually, and out of process of elimination I'd go with A .
Hope this helps ...
<span>Calcium, Phosphorus, Potassium, Sulfur, Sodium, Chlorine, & Magnisium are the seven elements that make up a small fraction (3.7) of living cells.</span>