Which of the following will assign the variable named timCall to the sentence: Tim called, "Lassie, come home!"

a. var timCall = Tim called, "Lassie, come home!";
b. var timCall = "Tim called, "Lassie, come home!";
c. var timCall = (Tim called, "Lassie, come home!");
d. var timCall = 'Tim called, "Lassie, come home!"';

d. var timCall = 'Tim called, "Lassie, come home!"';