 What is Eddie's response to Teena's mother's concern over the missing isotope?
When carefully controlled, the radiation stored up in such isotopes was used in many beneficial ways. 20 Eddie went inside and followed Teena to the kitchen. They had been ever since Eddie’s family had moved to Oceanview and his father had become head of the college’s atomic-science department. Teena’s father was chief engineer for the Acme Aviation Company, one of the coast town’s largest manufacturing concerns. 22 “Oh, yes, it’s fun, Mother,” Teena replied, wrapping wax paper around a sandwich. The main information was in the evening Globe , which Eddie rushed out to get as soon as he heard it plop onto the front porch. After having finished, Mr. Taylor handed the paper to Eddie and leaned back thoughtfully in his chair.
 He tries to comfort her by explaining isotopes.
 He only causes more concern for her after explaining isotopes.  He acts equally as concerned as her.  He tries to comfort her by explaining isotopes.  He tries to demonstrate his knowledge of radioactivity to her.