When we returned home from our six month vacation abroad, we found several drinking glasses shattered in place on the kitchen shelf. This can only happen during a sonic boom or when there is an earthquake. This must have been the loud noise that we heard not long after we drove off to the airport on the night we left for our vacation. Since there was no report on the car radio that night about earthquakes in the area, which always get a lot of attention, the glasses must have been shattered by a sonic boom, which is so common that it's never reported.
The speaker's conclusion about the "loud noise" assumes which of the following?
A. It is easy to tell the difference between glass shattered by an earthquake and glass shattered by a sonic boom.
B. A sonic boom always causes more damage in the house than an earthquake does.
C. The drinking glasses on the shelf were shattered because they were not safely protected.
D. No earthquake has occurred since the night the family left on their vacation.
E. Every time there is an earthquake in the area, some of the kitchen glassware will be shattered.
