General Knowledge
Medium
Question
When was helicopter developed?
A
1935
B
1939
✓ Official correct answer
C
1852
D
1923
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
1935
No member explanations yet for this option.
B
1939
No member explanations yet for this option.
C
1852
No member explanations yet for this option.
D
1923
No member explanations yet for this option.