"can't"
The correct option that can fill the given space in the sentence is "can't." The use of "can't" shows that it is not possible for the person that was seen yesterday to have gone abroad by the next day when the speech was recorded.
"Can't" is the slang form of "cannot." "Can't" is often used in speech as opposed to writing.
The speaker who saw the person yesterday is affirming that he actually saw the person. This implies that the person could not have relocated abroad between yesterday and today.
Thus, in this sentence, "may" and "must" will not suitably fill in the space provided because the intended meaning cannot be expressed with them. Therefore, "can't" is the correct word to fill the space in the sentence.
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