Linguistic relativity is the hypothesis that an individual’s language
a. is determined by one’s thoughts
b. influences one’s ability to have multiple thoughts
c. shapes and influences one’s thoughts
d. does not relate to one’s personal thoughts

Linguistic relativity is the hypothesis that the specific language that people use (such as French or Chinese) influence the kind of concepts and thoughts people have by providing (or lacking) words for specific concepts and by bringing the focus to some parts of the sentence rather than others..

The correct answer is c. shapes and influences one’s thoughts

Linguistic relativity, also known as the Shapiro-Wolf hypothesis is an hypothesis which states that an individual's language will shape and influence one's thoughts - c.

An example of this would be that people from countries who have more contact with snow will also have more words for snow and that this will enable them to have more vivid and rich internal models of snow. 

This hypothesis has, however, received some critisism.