The correct options are
B Tom's
C birthday?
Let’s examine the sentence: “Tomorrow, will we go to Toms birthday!” The sentence is in the form of question starting with the helping verb, “will.” Hence, the punctuation to be used here should be ‘question mark.’ Also, the sentence talks about the birthday of Tom but due usage of an ‘s’ straight after ‘Tom,’ this is not clear. In order to correct this and indicate birthday of Tom, apostrophe needs to be inserted between ‘Tom’ and ‘s.’ Apostrophes show possession. An apostrophe is normally used with the letters to show ownership or possession. With most singular nouns, simply add an apostrophe plus the letter s to do this. An apostrophe plus s is never added to make a noun plural--even a proper noun. So, the correct way to present this sentence is, “Tomorrow, will we go to Tom’s birthday?” Hence, Options B and C are the correct answers.