Select the sentence that correctly uses commas in a non-restrictive phrase.
a a river, that is polluted, is unsafe for swimming.
b polluted rivers, which can exist anywhere, are unsafe for swimming.
c when a river becomes polluted, it is no longer safe for swimming.
d however, rivers sometimes become polluted when nearby farms use too many poisons.

Your answer would be B.

Explanation:

The sentence that correctly uses commas in a non-restrictive phrase is sentence B. This sentence contains the nonessential relative clause which can exist anywhere.

Relative clauses, also called adjectival clauses, function as adjectives. They add description to the sentence; they modify nouns mainly. In this case, the clause modifies the noun rivers. Moreover, the clause is non-restrictive because the information it provides is not considered essential to complete the meaning of the sentence. That is, if the clause was dropped, the meaning of the sentence would be left unchanged (see 1).  For this reason, the clause is also offset with commas.

1) Polluted rivers are unsafe for swimming

a simile is first defined as a type of speech that uses one thing or phrase with comparisons to things of an unrelated kind, often in order to make a more vivacious description. so of the phrases above, only the last one (i swear she cast a shadow white as stone) would be considered a simile, as a shadow white as stone takes two unrelated things and uses them in an interesting way.

explanation:

mark brainliest and have a great day!