Question

Identify the prepositions in the following sentence.  
Building a tunnel to connect Macalaster Building with the Student Union will cost​ millions, but the energy savings will offset some of the cost.
A.
​to, the, some
B.
​will, some, of
C.
​a, to, the
D.
​with, of

Answer 1

d- prepositions conect nouns and prnouns i think

Answer 2

Answer is D.

 Prepositions are words that are used to connect words. In, on, at, of, up, to,among etc. are prepositions. In the sentence, the preposition "with" is used to make connection (relating them) between Macalaster Building and the Student Union. The preposition "of" indicates an amount (some) regarding the cost.