I'd guess b on this one. I don't know the definition of watershed, but the amazon is a pretty big expanse of water "stretching" a long way (albeit that water doesn't stretch).
Answer:
A climate model predicts future temperatures. This model was developed by several climate modeling research groups, including NASA's Goddard Institute for Space Studies. It is crucial that we continue to collect data and improve models, increasing their accuracy to refining our knowledge of climate and weather.
<span>196.94 million sq miles (510.07 million km²) Keep in Mind</span>
