Which invention allowed Germany to reduce the shipping capabilities of the Allied powers?

U-boat
SONAR
Fokker gear
tank

8 answers

https://www.google.com/search?sxsrf=ACYBGNSEPYMC5ejPAyhTAMSZYuYA_Td5Rw%3A1573594455771&ei=VyXLXdTdLpfS-gTx-qSIAg&q=germany+attacked+allied+shipping&oq=germany+attacked+allied+shipping&gs_l=psy-ab.3...49559.64013..65405...3.3..0.177.5202.1j40......0....1..gws-wiz.......0i71j33i160j33i299j33i22i29i30.FTpwa-G5MJU&ved=0ahUKEwiU5bmU0OXlAhUXqZ4KHXE9CSEQ4dUDCAs&uact=5
This is U-boat!
Right.
are u sure i think its fokker gear
the U-boat is right
its the U-boat
U-boat
For Future people, the answer is the Uboat.
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