Final answer:
Convection currents pushing tectonic plates apart create divergent boundaries, which can result in the formation of b. volcanoes and rift valleys.
Step-by-step explanation:
Convection currents moving tectonic plates away from each other create divergent boundaries. At these boundaries, the Earth's crust is pulled apart, allowing magma from the mantle to rise and cool, forming new crust. This process can lead to the creation of mid-ocean ridges and rift valleys.
Regarding the physical geographic features created by divergent boundaries, the correct answer to the question is that they lead to the formation of volcanoes (B) and can also create rift valleys as mentioned in the reference material discussing tectonic activities on Venus' lowland plains.