The Hawaiian word "Aa" (pronounced "ah-ah") is used to describe lava flows that have a surface made up of fractured lava blocks known as clinkers. Walking is extremely slow and challenging on a hardened "Aa" flow because of its exceedingly spiky surface.
Thus. Option B is correct.
What causes aa lava?
Lava flows quickly, forming aa. In these conditions, heat loss occurs quickly, increasing viscosity in the process. When differential flow tears the solid surface crust, the underlying lava cannot move quickly enough to seal the tear. The chunks are then created when pieces of the crust are tossed into the still-liquid lava and covered. The crust can occasionally separate into huge plates, creating a platy aa.
Lava flows more slowly and generates pahoehoe. In these conditions, a thick skin might develop that prevents heat loss. When a skin tear does occur, it heals quickly. The flow rate is influenced by both the rate of magma discharge and the steepness of the slope that the lava flows over. As a result, pahoehoe flows are linked with lower discharge rates and gentle slopes, whereas aa lavas are associated with high discharge rates and steep slopes.
Hawaiian names pahoehoe and aa (or a'a) refer to flows that are typically formed by mafic (ferromagnesian, dark-colored) lavas like basalt. Smooth, subtly undulating, or extensively hummocky surfaces define Pahoehoe lava flows.
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