In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement".
The Oseberg Ship was in use for several years before 834 when it was finally used as a grave ship for two important women.
The Oseberg Ship was excavated in the summer of 1904 in the Slagen Valley in Vestfold, by archaeologist Gabriel Gustafson. The ship lay in a grave mound, which had a diameter of 44 meters, on property belonging to the farm Lille Oseberg.