According to the text, it can be stated that

d) native and target languages can share some traces.

The text brings up teh example of a french speaker at the early stages of acquiring another language and although it seems that his first language makes him trip a lot, it actually helps him in other ways, like the syntax and the way that words are arrayed in a sentence.

Resposta em L16-20, onde repete o que a alternativa diz.