Question

read the excerpt from the dark game.
but how would hall get that telegram? that would take some doing, he admitted. then hall remembered mr. h., one of his trusted operatives. it was mr. h. who had alerted ml8 to the suspicious activities of swedens chargé daffaires in mexico city, folke cronholm. sharp - eyed mr. h. had noticed that cronholm was making frequent visits to the telegraph office, far more visits than one would expect from a representative of the swedish government, given the limited relationship between that government and mexico.
which inference can a reader make based on the information in the excerpt?
folke cronholm was spying for the allied nations.
folke cronholm was a german diplomat.
folke cronholm was secretly working for the germans.
folke cronholm was receiving many personal telegraphs.

Explanation:

Mr. H. alerted MI8 (British military intelligence) about Cronholm's suspicious activities. Since MI8 was part of the Allied forces in World War - I (assuming the historical context of "The Dark Game" which often deals with WWI - era espionage), and Cronholm's actions were seen as suspicious (frequent telegraph visits beyond what a Swedish diplomat would need given Sweden - Mexico relations), it can be inferred that he might be working against the Allies. The most logical inference is that he was spying for the opposing side (the Germans, as they were the main enemy of the Allies in WWI). There is no indication he was a German diplomat (he was a Swedish representative), no evidence of personal telegraphs (just frequent visits), and if he was spying for the Allies, his actions would not be considered suspicious by MI8.

Answer:

Folke Cronholm was secretly working for the Germans.