The nurse is caring for Charlie​ Jost, an​ 8-month-old infant diagnosed with failure to thrive​ (FTT). Charlie's​ father, Mr.​ Jost, is visibly concerned about his​ son's condition and diagnosis. He is pacing the room and approaches with a question when the nurse enters the room.​ "Are you here to do tests on my​ son? How do we know what is wrong with him if you​ haven't taken any​ x-rays or blood​ work?" Which response to Mr. Jost is most​ appropriate?
​A) "The staff from the laboratory will be here shortly to draw some​ blood."
​B) "There are no diagnostic tests for FTT. We diagnose the condition based on assessment and comparing your​ son's height and weight to the standard growth chart for his​ age."
​C) "Your son will go to​ x-ray as soon as they can accommodate​ him."
​D) "We are scheduling an MRI so that we can find the reason for this​ problem."