Question

choose the transition that shows cause and effect.
an earthquake damaged over one thousand buildings in napa, california, on august 24, 2014. as a result, governor brown asked president obama to declare a state of emergency.
as a result
however

Explanation:

The problem is about choosing a transition word that shows cause and effect. "As a result" is used to indicate the effect of a cause (the earthquake damaging buildings led to the governor's request for an emergency declaration). "However" is used for contrast, not cause - effect. So "As a result" is the correct choice.

Answer:

As a result