which transitional word is the best choice for this sentence?

his alarm rings every 10 minutes; the noise disturbs everyone in the house.
a) consequently
b) however
c) nevertheless
d) specifically

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explanation:

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the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).