One symptom of schizophrenia is called a word in which a person's verbalizations are so jumbled that they are virtually impossible to understand.

One symptom of schizophrenia is called a word salad, in which a person's verbalizations are so jumbled that they are virtually impossible to understand.

Explanation:

"Word salad" is the phenomenon of language incoherence, where language is often incomprehensible because there is no meaning relationship between words, phrases or sentences. Many sentences are incomplete and unrelated, the subject of the language is changing rapidly, mixed words are used, and word formation is broken.

The causes of this type of incoherence can be organic mental disorders, schizophrenia and other psychoses.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."

answer; they both highlight the power of the situation in determining behavior;