Why are scientists unable to predict exactly when an earthquake will occur? A
They do not have enough seismographs.

B
There are not enough scientists to monitor all of the faults.

C
There is no way to determine when stress along a fault will be released.

A or C

Explanation:

There is currently no way to reliably predict when an earthquake will ...It's very hard to exactly understand how rocks behave under the ... the earthquake of L'Aquila, Italy, in 2009, most scientists remain skeptical of this method. ... At the moment we can't even be sure if such precursory signals even exist.

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