Select the most appropriate option to substitute the underlined segment in the given sentence.

She is one of those musicians who composes symphonies without using computer software.

The correct option is compose.

Explanation:
In the given sentence, "She is one of those musicians who composes symphonies without using computer software," the relative clause introduced by the relative pronoun "who" modifies the plural noun "musicians" (which is the antecedent), rather than "one".

When using the grammatical construction "one of those + plural noun + relative pronoun (who/which/that)", the relative pronoun refers back to the plural noun. Consequently, the verb that follows in the relative clause must agree with the plural subject.

Since "musicians" is plural, it requires the plural form of the verb, which is "compose", rather than the singular form "composes".

Corrected Sentence:
"She is one of those musicians who compose symphonies without using computer software."