In a certain code language, ‘moon have craters’ is written as ‘nu mu su’ and ‘craters are very big’ is coded as ‘ku nu ru vu’. How is ‘craters’ coded in the given language?

Given: 

In a certain code language, ‘moon have craters’ is written as ‘nu mu su’ and ‘craters are very big’ is coded as ‘ku nu ru vu’.

So, the code of craters is nu.

Thus, correct option is (d).