Which is the correct option to complete the sentence below? My son is allergic t...

Questão de Inglês da banca EN aplicada no concurso ESCOLA NAVAL (2008). Confira a resolução completa abaixo:

Which is the correct option to complete the sentence below?
My son is allergic to sea food. If he (1)__________________ shrimps, for example, his throat (2)_________________ immediately.