That they stayed backward, and poorer than they needed be, and were thus vulnerable to the West's gunboat diplomacy tactics.
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Answer:
None of the above.
Explanation:
The Decca system was discontinued in 2001. Loran-C replaced the Decca navigation system which was more accurate. Loran-C uses low frequency radio waves.
SONAR (sound navigation ranging) was developed in World War I for threats like submarines.
Seismic profiling uses frequencies lower than 3 to 30 Hz which is not considered as high frequency.
B. Impeaching means to have somebody recognized of crimes, and then brought to something to have the punishment decided, or to simply acquit them (exonerate)
Richard Trevithick is the person who created the train and He is an English engineer
