During world war ii, the effectiveness of german u-boats and underwater mines was ended by the development of select one:
a. acoustic countermeasures.
b. sonar.
c. centimetric radar.
d. both sonar and centimetric radar.
e. all these answers are correct.

select one:
a. acoustic countermeasures.
b. sonar.
c. centimetric radar.
d. both sonar and centimetric radar.
e. all these answers are correct.
A quick google search said centimetric radar was invented in 1935 during the range of WWII.
Hope I helped some

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During world war ii, the effectiveness of german u-boats and underwater mines was ended by the development of select one: a. acoustic countermeasures. b. sonar. c. centimetric radar. d. both sonar and centimetric radar. e. all these answers are correct.

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During world war ii, the effectiveness of german u-boats and underwater mines was ended by the development of select one:
a. acoustic countermeasures.
b. sonar.
c. centimetric radar.
d. both sonar and centimetric radar.
e. all these answers are correct.