Which sentence needs an apostrophe added to be correct

The user did not add any option but I found the same question elsewhere on the internet. The options are as follows:
A. You are not going to believe what I saw on the way home today.
B. Youre going to need another blanket.
C. Your locker is the third one down on the left Marcie.
D. Your name is spelled almost exactly like mine.
From the options given above, the correct option is B. The correct sentence ought to be written like this: You're going to need another blanket.
Apostrophe is one of the punctuation marks that are used in English language. It has two basic functions, one it shows possession and two, it is used in place of a missing word.  An example of a sentence in which apostrophe shows possession is given below:
The children's room is painted yellow.
And in the  case of word omission an example is given below:
They've not acted wisely.
Note that, the word 'they and 'have' are the ones that have been contracted to 'they've.

The answer should be c