Well, none of them are conversational, but only D seems reasonable There is no call for inversion of the subject and verb under normal circumstances, which is what is offered in the other 3 options.
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dslhsjsAll day long, by the side of the road ____, looking at the passing cars and people.It is a pretty awkward sentence as written in my opinion. Nevertheless, based on how it was written, the answer is D, because you need a subject and a verb to complete this sentence. We can re-arrange the phrase "by the side of the road" to make it read: " All day long,