Which factor contributed least to the extinction of the passenger pigeon species?
A) laws that banned the hunting of passenger pigeons to sell in new markets
B) improved communication technology, which tracked the pigeon flocks
C) expansion of the railroads, which opened up new markets for selling pigeons
D) increased use of the passenger pigeons as a good source for humans

The correct option is A) laws that banned the hunting of passenger pigeons to sell in new markets

Explanation:

All other options describe ways that enabled passenger pigeons' extinction. Laws to ban hunting these pigeons had the opposite effect, that is saving the species from extinction.

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