Which technological advancement was most useful for helping to break the stalemate on the western front a. telegraph
b. tanks
c. submarines
d. telephone

make sure the answer is right :)

B.

Explanation:

The tanks helped them across the dead mans zone

chronological thinking is an indispensable tool to structure a historical narrative and to give meaning to a sequence of events. the final section presents the results of a survey to test the chronological thinking of lower secondary school students carried out by the educational research institute.

answer; mission;