GMAT Sentence Correction (SC) | Re: Although his early critics had viewed Christopher Marlowe as

When within the pressure cooker time at hand on the D-day, it will be prudent to eliminate first grammatical errors before attempting to go by meaning. This is a classical model of such an approach.

First thing is that an adverb modifies a verb it follows. In A and B and E what follows 'seriously' is to consider, an infinitive that is not a verb. For that matter even in D, the adverb is modified by a participle rather than a verb. This is ungrammatical. Therefore, one can make bold to omit
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