Read the following paragraph from "Five Hours to Simla." After the cacophony of screeching brakes and grinding gears, there followed the comparatively static hum of engines, and drivers waited in exasperation for the next lurch forwards. For the moment there was a lull, curious on that highway. Then the waiting very quickly began to fray at the edges. The sun was beating on the metal of the vehicles, and the road lay flattened across the parched plain, with no trees to screen it from the sun. First one car horn began to honk, then a bicycle rickshaw began to clang its bell, then a truck blared its musical horn, and then the lesser ones began to go pom­pom, pom­pom almost in harmony, and suddenly, out of the centre of all that noise, a long, piercing wail emerged.
Which words BEST describe the mood created by these sentences?
A. growing anger
B. building tension
C. heightened anxiety
D. mounting suspense