The given statement implies that there is some important development in Kochi where a startup company has launched something that enables cashier-less shopping experience.

 

Now, coming to the options, both the words in option A are irrelevant since mechanical store will not be able to give cashier-less shopping experience to the consumers.

 

Option B is also not correct since the article used is wrong if the first word is considered as the correct one and this makes it inconsequential to even consider the second word for the second blank in the given sentence.

 

Option C is also not correct since the same error as in the previous option is there in the options in this case as well. This can also be eliminated safely from our consideration.

 

Option E is also not correct because of a word starting with a vowel and the usage of ‘a’ as the article preceding it.

 

Option D is the correct choice because the shop is about cashier-less shopping experience and that can be provided by only a fully-automated shop and both the words fit the context perfectly in the given statement. 

 

This makes option D the correct choice among the given options.