Many students today display a disturbing willingness ________ choose academic institutions fields of study and careers ________the basis of earning potential.
句意：如今，许多学生表现出了一种令人不安的意愿，他们以潜在的收入为基础选择学术研究 领域和职业。willingness to表示“做……的意愿”。on the basis of为固定搭配，表示“在……的基础上”。故选 B。