Final answer:
The height of the tree increased to 300% of its original height, which signifies a 200% increase from the initial height. Thus, the correct answer is B. 200%.
Step-by-step explanation:
The question asks about the percentage increase in the height of a tree over a period of time.
To calculate the percentage increase, we need to determine the difference between the final value and the initial value, and then divide that by the initial value and multiply by 100 to get the percentage. In this case, the tree grew to 300% of its 2003 height by 2013.
Since the tree's height in 2013 is 300% of the height in 2003, this means it is 3 times its original height. The original height is considered to be 100% (as a baseline). Therefore, the increase is 300% - 100% = 200% increase.
So the correct answer is B. 200%.