[单选] 一个3周大的男孩被带到有1周强迫呕吐史的儿科医生办公室。 几乎每次喂奶后他都在呕吐。 呕吐物含有大部分未消化的配方，并且是非胆汁的。 检查时，他的口腔粘膜干燥，他的前font门似乎凹陷了，他的毛细血管补充时间为3-4秒。 腹部检查发现上腹部有2 cm肿块。 其余的考试没有什么变化。 以下哪种电解质发现最有可能出现？A 3-week-old boy is brought to the pediatrician"s office with a 1-week history of forceful vomiting． He has been vomiting after almost every feeding． The vomitus contains mostly undigested formula and is non-bilious． On examination， his oral mucosa is dry， his anterior fontanelle appears to be depressed， and his capillary refill is 3-4 seconds． Abdominal examination reveals a 2 cm mass in the epigastrium． The remainder of the examination is unremarkable． Which of the following electrolyte findings will most likely be seen？