c. 0.4923
Delta is given by N(d1)

Dividend adjusted stock price = S*e(-dividend yield*time) = 53*e^(-0.02*0.5) =$52.473
d1 = (ln(52.473/55) + (0.055+0.27*0.27/2)*(0.5))/(0.27*(0.5)^0.5)
d1 = -0.00685
N(d1) = 0.4923
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