Answer:
Comma splice.
Step-by-step explanation:
A comma splice occurs when two independent clauses are joined together by a comma to be used as a single sentence. This construction is wrong as the two independent clauses need to be joined by a conjunction to be taken as a single sentence or be separated into two sentences.
In the given sentence, the error is in the use of the comma between "de sks" and "for example...". Instead of the comma, we can use a period/ full-stop, thereby making it into two independent sentences.
Thus, the correct construction will be
Most office workers spend more than fifty percent of their time at their desks. For example, they spend their time preparing documents, answering calls, and scheduling appointments.