Serita Has Experienced Psychotic Symptoms That Have Not Yet Significantly

Serita has experienced psychotic symptoms that have not yet significantly impacted her ability to function, but they are still concerning. According to Serita's mom, Serita suddenly began experiencing these symptoms about four months ago, when they seemed to come on suddenly. Serita seems to have very flat affect and to be confused by her experiences. Given this information, which diagnosis is most appropriate?

A) schizophrenia
B) delusional disorder
C) schizophreniform disorder
D) brief psychotic disorder