Which of the following was one of the parents of chardonnay?

D.

In Burgundy, during the early Middle Ages, chardonnay arose as a seedling―a natural cross of the noble red grape of Burgundy, pinot noir, with the white grape, gouais blanc (GOO-ay BLAHNK) , thought to have been brought to eastern France by the Romans from Croatia.  DNA testing in 1999 uncovered the unorthodox parentage, a shock to the international wine community at the time, as gouais blanc is considered so mediocre that several French districts tried to ban it and it is no longer even cultivated in France.