Which word and punctuation mark corrects the punctuation error in this sentence?

let's try putting the couch on that side of the room for instance.

a.
room,

b.
couch,

c.
try,

Afruit stand has to decide what to charge for their produce. they decide to charge \$5.30$5.30dollar sign, 5, point, 30 for 111 apple and 111 orange. they also plan to charge \$14$14dollar sign, 14 for 222 apples and 222 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?