Flagler served as

of Standard Oil of New Jersey until

director, 1911

janitor, 1911

O partner, 1991

director, 1913

Flagler served as director of Standard Oil of New Jersey until 1911.

Option is: director, 1911

Explanation:

Standard oil was found by Henry Morrison Flagler in New Jersey. He served as director of Standard Oil until 1911. Standard Oil increasingly gained total control of oil refining and marketing in the United States of America. A vertical system replaced the old distribution system in the Kerosene industry by Standard Oil.

Standard Oil moved its headquarters to New York City to centralize its business in the city. The success gained by the Flagler in Oil industry made him to start Oil refinery.