Mock - AM: Q57 (Intrinsic P/E) guidance, solution, correct, problem, provide

giorgio10

Solution:
“Intrinsic P/E = (1 – b) / (r – g)”
The inputs to the solution in this problem are based on most recent period data - not forecast data. As such, it seems the information being utilized is best suited for TRAILING P/E, in which the correct notation would be:
“Intrinsic P/E = (1 – b)(1+g) / (r – g)”
Can anyone provide guidance on the correct angle to approach this problem, and why it is evident here?