Answer:
D) Dunbar did not despair; he continued to write doggedly
Step-by-step explanation:
The use of the semi colon gives the sentences a logical organization. First, a situation is described: the fact that Dunbar did not despair . Indirectly, we infer that there might have been things from the context that made Dunbar feel tense; an exam ,probably. However , he did not lose control of the situation for he was determined to go on with his task. This concessive idea is expressed with the semi colon. The use of the connector however can be substitued by a semi colon.