Easier,sooner,quicker,faster用法

Plants,animals,insects,and birds sensed the coming of a strom _ than people did.
其中的空格該填easier,sooner,quicker,faster的哪一個... 謝謝
Update: 補充一下,這題標準答案是sooner,出處81年大學聯考題
Update 2: quicker means getting something done within a short time frame,why can't we use quicker?
faster means moving or happening quickly,why can't we use faster?
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