How many tails does this test have?

Studies seem to indicate that the average attention span has gradually decreased in the past 20 years with the rise in smartphones. Based on the R output below, has there been a significant decrease in the average attention span since the early 2000s? Please use a significance level of 5%. > t. text(x, alternative = "less", mu =700) One Sample t-test data: x t = -2. 2479, df = 9, p-value = 0.02559 alternative hypothesis: true mean is less than 700 95 percent confidence interval: -Inf 697. 6011 sample estimates : mean of x 687 How many tails does this test have? O zero O two O three one