Consider the following argument:

Heart disease is the leading source of death in the USA. This is confirmed by medical data stretching back over the last fifty years. So the funds the government assigns to medical research should be focused upon heart disease.

Which of the following tacit premises does the argument rely upon?

Heart disease is always fatal

Governmental medical research funding should be increased

We do not have medical data earlier than the last fifty years.

Heart disease is sometimes fatal

Governmental medical research funds should focus upon the leading source of death