The correct option is
B romantic
Answer : D
Explanation:
First we have to understand the sentence.
It describes the place Venice, and mentions the fact that a lot of people visit it for their honeymoon. Which suggests us that the adjective with which we have to ideally fill the blank has something to do with love.
Now looking at the options provided,
The word "romantic" means something that expresses love.
Thus from among the options, it is the most appropriate word.
The rest of the words do not make sense.
If it were "dirty", no one would want to visit that place.
Same goes for "polluted".
"wealthy" also does not quite fit in. It does not quite go along with the following sentence.
Therefore the correct complete sentence is :
Venice is a very ROMANTIC city. A lot of people go there for honeymoon.