Question

Which one of the following is not the 20th century contribution?
a) Electric train
b) Motorised boats
c) Monorail
d) Supersonic aeroplanes
Please answer this question...
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Answer 1

Answer:

Electric train, motorised boats and monorails. They were all introduced in the 19th century.

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Answer 2

Except (d) all are 19th centuries contribution of