not sure of selected answer is correct.please provide explanation! thank you

Suppose you are building a model to predict the amount of traffic a web site will get based on a variety of factors, for example the type of content it has, the amount of advertising that is devoted to it, and the amount of money used to create the site. Suppose that you add another variable such as the number of links to it on other sites, and this new variable is not statistically significant and adding it does not increase the R2 of the regression much. But you think it should be important and decide to keep it in anyway. A justifiable reason to keep it is: O Removing it would not be very difficult. It is possible that with the addition of other variables its statistical significance will increase. There are probably also many other variables you could add to the regression that will not be statistically significanteither. O Removing it might not change the R2