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The following figure is from a recent report cited as 'Alzheimer's Association. (2019). 2019 Alzheimer's disease facts and figures. Alzheimer's & Dementia, 15(3), 321-387. " This figure represents in Alzheimer's disease among people aged 65 years and above in the U.S. Please fill the blank with select the most appropriate option. [Hint: Refer to time distribution (slides 31 to 47 of Descriptive studies] FIGURE 4 Projected Number of People Age 65 and Older (Total and by Age) in the U.S. Population with Alzheimer's Dementia, 2010 to 2050 Millions of people with Alzheimer's Ages 65-74 Ages 75-84 Ages 85+ 13.8 14 11.6 12 10 8.4 B 5.8 2 Year 2010 2020 2030 2040 2050 Created from data from Hebert et al 41051 a. Secular trend Ob. Age disparities Oc. Cyclic trend Od. Seasonal trend