if am i ending my sentence with the word 7 a. m., which is correct?

a. 7 a. m. (one period because it is the end of the sentence)
b. 7 a. m.. (two periods because of the one after the letter "m" and the period at the end of the sentence)

the correct answer is:   [d]:   " espionage " .

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industrialization in great britain began with the global 'industrial revolution', a pioneer. industrialization in russia was the last in europe, a laggard.

great britain’s industrialization was driven by individual citizens, while russia’s was guided by the government.