Final Answer:
Increased steadily accurately describes the trend in voter turnout in the three most recent presidential elections depicted on the graph. Option 3 is the answer.
Step-by-step explanation:
Upon analyzing the graph, it becomes evident that there is a consistent upward trend in voter turnout across the three most recent presidential elections. This is indicative of an increase in voter participation over time. Option 3, "Increased steadily," aligns with this observable pattern, making it the correct choice.
The other options, such as 1) Decreased consistently, 2) Varied unpredictably, and 4) Remained constant, do not accurately capture the depicted trend in voter turnout on the graph.
Option 3 is the answer.