It 's true . We had a small quake just a while ago . Technically , it was a magnitude 4.0 over in Alamo , but we felt a strong quick shake here . Where was I ?

Based on the preceding passage, choose your answer for question Why are some residents startled in Alamo ?
Choose your answer from:
(A). There was a a high magnitude eruption .;
(B). There was a large volcanic eruption .;
(C). There was an earthquake .;
(D). There was a strong wave near Alamo .;
The answer is:
(C).