Some of the Most Profound Scientific Breakthroughs in the Understanding

Some of the most profound scientific breakthroughs in the understanding of disease occurred because of

A) a well-formulated research plan to understand and overcome the disease.
B) virtually unlimited funding of programs designed to conquer the disease.
C) directly building on the results of the research immediately preceding it.
D) the collaboration and corroboration of many different disciplines.
E) unintentional events or outcomes.