Exactly seven toy-truck modelsF, G, H, J, K, M, and Sare assembled on seven assembly lines, exactly one model to a line. The seven lines are arranged side by side and numbered consecutively F through 7, Assignment of models to lines must meet the following conditions:
F is assembled on a lower-numbered line than J.
M is assembled on the line numbered one lower than the line on which G is assembled.
H is assembled on line 1 or else line 7.
S is assembled on line 4.
Which one of the following is an acceptable assignment of toy-track models to lines, in order from line 1 through line 7?
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