Final answer:
Based on the memoir of Grace Morris Craig, which refers to an event in 1917, all the provided dates for the election of Grace Dobson as "Chairman of the Board" are incorrect, as they all occur in the 1970s.
Step-by-step explanation:
The date on which Grace Dobson was elected "Chairman of the Board" cannot be accurately determined from the provided reference, as the memoir of Grace Morris Craig discusses her experiences in relation to World War I and the election of December 17, 1917. None of the provided dates (March 3, 1971; May 5, 1972; August 8, 1973; November 11, 1974) align with the significant historical event mentioned in her memoir, which is of the year 1917. Therefore, based on the available information in Grace Morris Craig's memoir, all the given options are incorrect.