5. New timber harvesting equipment becomes available that reduces the time to cut and harvest logs by half. *
O
A. Decrease, left
B Increase, right

i would go with the last one

its c not d   tell me if that´s correct

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.