Answer:
3. It is not an easy thing to eat once a day.
Explanation:
The third sentence is the phrase in the sentence because it does not contain both a subject and a verb simultaneously. There is a verb there notably which is, eat, but there is no accompanying subject. A phrase is a group of words that do not contain a subject and a verb. 
There are various types of phrases and these include; the verb phrase, adjectival phrase, noun phrase, adverbial phrase, etc. The third sentence is simply an observation or statement without reference to a subject.
 
        
             
        
        
        
Key themes of the Romantic Period
Revolution, democracy, and republicanism. ...
The Sublime and Transcendence. ...
The power of the imagination, genius, and the source of inspiration. ...
Proto-psychology & extreme mental states. ...
Nature and the Natural.
        
             
        
        
        
Answer:
Tarak Mehta ka ooltah chashma
 
        
                    
             
        
        
        
I think the answer is c...