The metaphor and simile in this excerpt emphasize the importance of Excalibur to King Arthur.
Indeed, the narrator is talking about the day he gained possession of the sword, and uses these literary devices to highlight how meaningful this event was to him and how it changed his life: "have worn it, like a king."
 
        
             
        
        
        
"To try to write certain sentences is difficult"
The correct statements are 1, 2 and 3.
1) The sentence is correctly written. The pattern "to try to do something" is correct and can be used. 
2) The sentence contains more than one infinitive. It contains two infinitive verbs. TO TRY and TO WRITE.
3) One infinitive is inside another infinitive phrase. "To try to write certain sentences" is an infinitive phrase, it functions as a noun because it is the subject of the sentences. So, the second TO INFINITIVE is inside the main infinitive phrase. (That is the reason why number 4 is not correct)
 
        
             
        
        
        
Answer:
c. I think sorry if its incorrect