Final answer:
The journal's details about crew management and resource usage indicate it was intended for the authorities financing the expedition.
Step-by-step explanation:
The best indication that the primary audience for the journal entry is the authorities financing the expedition is the detailed account of the activities and management of the crew. The journal mentions obtaining fresh greens and beef for the crew, caulking and repairing the ship, and the punishment of Seaman John Thurman for his insubordination. This level of detail suggests that the author is providing updates on the use of resources and the discipline needed to maintain order, which would be crucial information for investors or sponsors concerned with the expedition's progress and governance.