The problem whose attempted solution has brought such a train of disaster in its wake is an accompaniment of our modern way of life. Long before the age of man, insects inhabited the earth—a group of extraordinarily varied and adaptable beings. Over the course of time since man’s advent, a small percentage of the more than half a million species of insects have come into conflict with human welfare in two principal ways: as competitors for the food supply and as carriers of human disease. Disease-carrying insects become important where human beings are crowded together, especially under conditions where sanitation is poor, as in time of natural disaster or war or in situations of extreme poverty and deprivation. Then control of some sort becomes necessary. It is a sobering fact, however, as we shall presently see, that the method of massive chemical control has had only limited success, and also threatens to worsen the very conditions it is intended to curb. –Silent Spring, Rachel Carson Which of the following best describes the writer’s method of development in these two paragraphs? It contrasts the magnitude of insects’ impact on other species with humanity’s impact. It explains the causal relationship between human-insect competition and the use of harmful pesticides. It discusses examples of less harmful methods used to control insects’ destruction of crops and habitats. It describes the coevolution of insects and humans over time as evidence that sustainable solutions can be found. It narrates historic changes in human civilization to personalize and highlight the beneficial aspects of technological development.