The word "celebrate" means to acknowledge and honor achievements or events, which fits the context of honoring the volunteers. Options 1, 2, and 4 do not fit the intended positive context.
21 32 54 86 131 186
...532, 276, 144, 84, 52, 36
80, 88, 101, 122, 150, 185
186, 179, 170, 162, 146, 131, 114
9 17 53 103 310 619
...191 341 221 331 251 281
- 80, - 44, - 4, 88, 216, 380
125, 142, 199, 320, 489, 778
74, 79, 86.5, 101.5, 109, 124, 141.5
24, 12, 22.5, 45, 157.5, 708.75