According to the results presented by the experiment, the relationship between the lift force and the vesicle radius would best be described as:

Answer: Exponential

Explanation: Examining and studying both the second and third columns in Table 1, it's clearly shown that as the radius increases, so does the lift force, eliminating choice B. Having chosen the first two vesicles, the estimated slope, or "rise over run," is calculated to be (4.7 - 0.2) / (20.5 - 8.7) ~ 4.5/12 ~ 0.4. If we instead use the last two vesicles, we obtain a value of (153.6 - 87.1) / (67 - 50.9) ~ 66.5/16 ~ 4. Therefore, the slope keeps increasing at a rate perceived to be ever-higher, which can be affirmed by inspecting other combinations of data for the vesicles. On this wise it can be concluded that the relationship is exponential.