The Following Table Describes the Survival of Patients Treated from Disease

The following table describes the survival of patients treated from disease X from 2015 to 2017 followed for 3 years (assuming no loss to follow-up) .What was the probability of surviving the third year? $\begin{array}{r}\text { Number alive at the end of year }\quad \\\begin{array}{|l|l|l|l|l|}\hline \text { Year of treatment } & \text { Number of patients treated } & \quad 1 \text { year } & \quad 2 \text { year } &\quad 3 \text { year } \\\hline 2015 & 100 & 67 & 42 & 30 \\\hline 2016 & 50 & 31 & 18 & \\\hline 2017 & 75 & 52 & & \\\hline \text { Totals } & 225 & 150 & 60 & 30 \\\hline\end{array}\end{array}$

A) 0.29
B) 0.33
C) 0.61
D) 0.67
E) 0.71