(A) whenever a society has plentiful resources, some members of that society devote themselves to the study of natural processes.
(B) plants cannot be cultivated by someone lacking theoretical knowledge of the principles of plant generation and growth
(C) agriculture first began in societies that at some time in their history had plentiful resources
(D) early agricultural societies knew more about the natural sciences than did early nonagriculatural societies
(E) early societies could have discovered by accident how the plants they cultivated reproduced and grew.
18. In the past decade, a decreasing percentage of money spent on treating disease X went to pay for standard methods of treatment, which are known to be effective though they are expensive and painful. An increasing percentage is being spent on nonstandard treatments. which cause little discomfort. Unfortunately, the nonstandard treatments have proved to be ineffective. Obviously, less money is being spent now on effective treatments of disease X than was spent ten years ago