To determine which rod of glass will require the least heat to begin melting, we can infer that smaller diameter rods typically have a larger surface area-to-volume ratio and thus heat up faster. In this case, the rod with the smallest diameter is the best candidate for requiring the least heat to start melting.
Given the diameters of each rod:
- Yellow: 6 cm
- Clear: 10 cm
- Green: 4 cm
- Blue: 2 cm
- Teal: 6 cm
The Blue rod has the smallest diameter at 2 cm, which suggests that it will require the least heat to begin melting.
Thus, the answer is:
A. Blue
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