A is the best answer. The first paragraph identifies two major problems faced by the archaeological profession: inadequate funding and illegal digging. Lines 12-15 indicate that the author is going to suggest how to remedy both problems, thereby benefiting the archaeological profession. The author proceeds to propose allowing the sale of excavated artifacts (lines 16-19) and to explain how this would solve both problems (lines 19-26). The author then supports the proposal by countering possible objections to it, and in the last paragraph explains how the proposal would curb illegal digging (lines 74-80). Thus, the way information is organized in the passage indicates that the author's purpose is to suggest that allowing the sale of excavated artifacts would provide funds for the archaeological profession and curb illegal digging.