The answer is synthetic because synthetic means a substance made by chemical synthesis to imitate a natural product.
Leap years are included to keep our modern day calender in alignment
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The answer should be the second sentence: Blowing wildly, the icy winter wind tore my woolen cap from my head, as it makes the most sense.
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The setting is the time and location of a story. (Where and when it takes place).
The first sentence definitely wouldn't improve improve the description in the setting of a story, nor would the last. The third sentence includes the location (basketball game), but does not describe it.
Answer:
4. we timed ourselves during the experiment
