An 8-hour-old term infant develops increased respiratory distress, hypothermia, and hypotension. A complete blood count (CBC) demonstrates a white blood cell (WBC) count of 2500/mL with 80% bands. The chest radiograph is shown below. Which of the following is the most likely diagnosis?
Congenital syphilis Diaphragmatic hernia Group B streptococcal pneumonia Transient tachypnea of the newborn