Are the underlined words an infinitive or a prepositional phrase?

Do you prefer ice cream to cake?

A.
prepositional phrase

B.
infinitive
I think A.

Question

Are the underlined words an infinitive or a prepositional phrase? 

Do you prefer ice cream to cake?
  
 
 

 
 

  

  A. 
  prepositional phrase   
   

 
 

  

  B. 
  infinitive  
I think A.

conqueror · Answer

You must tell us what the underlined phrase is.

conqueror · Answer

@Abbygirl15

What is the underlined phrase ??

anonymous · Answer

well what do you think it is

abbygirl15 · Answer

I said I think it is A.

anonymous · Answer

oh srry i didnt see that

conqueror · Answer

'cake' is the only thing underlined ? But it should be a phrase underlined.

anonymous · Answer

so a prepositional phrase=will begin with a preposition and end with a noun, pronoun, gerund, or clause, the "object" of the preposition.

abbygirl15 · Answer

my keyboard mess up I meant to cake.