New dialects are not a result of language convergence. Option D is correct.
Language convergence refers to a form of linguistic change in which languages come to structurally resemble one another as a consequence of prolonged language contact and mutual interference.
Language convergence takes place in geographic areas with two or more unrelated languages in contact.
A dialect refers to a variety of a language that signals where a person is from.
It would be "New Dialects" that is usually not a result of language convergence, since for language convergence to take place there needs to be a "blending" of two or more distinct languages.
Among the most important inventions were movable type and gunpowder. Moveable type allowed them to produce writing in larger quanaties whle gunpowdeer helped them to defend themselve ibeter.