B. Took around half an hour to complete.
The complete predicate includes the verb and the rest of the sentence.
<span> According to the dictionary em dashes are used in writing and printing purposes to show a break in thought or sentence structure
In the above example the correct use of em dashes is in the sentence that is
</span><span> Instead of another trip – her first choice—Jessica opted to take the shopping spree for her prize.
</span>so correct option is B
hope it helps
