Which of the Following Questions Contains All the Elements of a PICO

Which of the following questions contains all the elements of a PICO question?

A) Is parent-delivered intervention effective, when the parents are trained to provide intervention and collect rating scales of their child's performance across intervention sessions?
B) What intervention approaches are suited to group intervention when compared to individual intervention?
C) In children with moderate-severe phonological impairment characterized by phoneme collapses, is minimal pairs more efficient than multiple oppositions for improving changes in children's percentage of consonants correct?
D) In children with moderate-severe phonological impairment, is group therapy as effective as individual therapy?