'Daunting' is an adjective that means making you feel slightly frightened or worried about your ability to achieve something. 'Daunting' is an appropriate word that can describe the feeling of losing the job, in this sentence.
By replacing (B) and (D), the sentence gives the meaning that while the stress of losing a job can be daunting, there are a number of ways one can gain control of the situation and keep the morale up and rediscover (to find something or someone again after losing or forgetting about it for a long time) their sense of purpose.
Hence, option a) is correct.
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