The error in the given sentence "Because we stayed up too late last night, it was difficult to wake up and we were almost late for church." is fragment error, i.e., option 1.
What is a fragment error?
An error of missing sentence parts, most often a subject or a verb is referred to as fragment error.
In the given sentence "Because we stayed up too late last night, it was difficult to wake up and we were almost late for church.", it is not showing the related verb, so it can be a fragment error.
Thus, the correct answer is 1.
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