D doesn't work because the stimulus says "Life as we know it...". This accounts for the possibility that unfamiliar forms of life could've evolved without the presence of water.
Can we throw out answers A, D, and C based on usage of the word "usually"?
Are you sure?
D doesn't work because the stimulus says "Life as we know it...". This accounts for the possibility that unfamiliar forms of life could've evolved without the presence of water.