Answer:
A.1
Explanation:
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Some omnivores<span> (animals that eat both plants and meat), like humans,</span>have incisors<span> like </span>herbivores<span>. In </span>carnivores<span> (meat-eating animals) like cats, the </span>incisors<span> are often quite small and the </span>canine teeth<span> are very long and suitable for tearing meat.</span>
The noun in this sentence which is uncountable, meaning that it names something that cannot be counted is the noun water.
You cannot count how many waters there are - it is uncountable. The other nouns, students and pitcher are countable, so they cannot be the correct answers, but rather water is.