Based on the climate data that Sarah and Ruby collected, the most accurate conclusion is:
A. locations by the ocean typically do not get as cold in the winter or as hot in the summer as locations that are located inland.
This conclusion is supported by the temperature data, which shows that Eureka (by the ocean) has consistently lower average high temperatures in the summer (July and August) compared to Redding (inland) and also experiences milder average low temperatures in the winter months (January and December). This reflects the effect of the ocean on moderating temperatures compared to inland areas.