An Assembly Line Has to Perform 10 Work Elements,whose Time

Multiple Choice

An assembly line has to perform 10 work elements,whose time requirements follow below.An operations analyst has found a solution using some heuristics.The solution follows below.
Solution
$$\begin{array} { | c | c | c | c | } \hline \begin{array} { c } \text { Work } \\\text { Elements }\end{array} & \begin{array} { c } \text { Time } \\( \mathrm { sec } ) \end{array} & \text { Station } & \begin{array} { c } \text { Work } \\\text { Elements } \\\text { Assigned }\end{array} \\\hline \mathrm { A } & 45 & 1 & \mathrm {~A} , \mathrm {~B} , \mathrm { C } \\\mathrm { B } & 30 & 2 & \mathrm { D } , \mathrm { E } \\\mathrm { C } & 15 & 3 & \mathrm {~F} , \mathrm { H } \\\mathrm { D } & 30 & 4 & \mathrm { G } , \mathrm { I } \\\mathrm { E } & 50 & 5 & \mathrm {~J} \\\mathrm {~F} & 40 & & \\\mathrm { G } & 30 & & \\\mathrm { H } & 30 & & \\\mathrm { I } & 60 & & \\\text { J } & 80 & & \\\hline\end{array}$$
If the cycle time of the line is 90 seconds,what is the efficiency of the assembly line?

A) less than 85%
B) greater than 85% but less than 90%
C) greater than 90% but less than 95%
D) greater than 95%