The correct option is A SCID
SCID (Severe Combined Immuno Deficiency) is an immunodeficiency disorder caused due to the deletion of the gene for ADA (Adenosine Deaminase). This disorder effects the development and function of the immune cells of the affected individual.
AIDS (Acquired Immuno Deficiency Syndrome) is a immunodeficient syndrome caused due to infection by HIV. It damages the immune system.
ARDS (Acute Respiratory Distress Syndrome) is a rapidly progressive disease in critically ill patients caused due to leakage of fluid into the lungs, making it difficult for them to breathe.
SIDS (Sudden Infant Death Syndrome) is a syndrome which results in sudden unexplained death of child within one year of age.