To determine which refrigerant has the lowest Global Warming Potential (GWP), let's compare the GWPs of the given refrigerants:
- R-410A has a GWP of 2088.
- R-134A has a GWP of 1430.
- R-152a has a GWP of 124.
- R-744 has a GWP of 1.
From these values, we can see:
- R-410A's GWP is 2088.
- R-134A's GWP is 1430.
- R-152a's GWP is 124.
- R-744's GWP is 1.
Comparing all these values, the refrigerant with the lowest GWP is R-744, which has a GWP of just 1.
Therefore, the answer is:
D
R-744
