The correct option is A haven't seen
Present perfect tense verb is used to refer to an action that started in the past and has continued up until now. It takes the form of S + has/have + V3 + O.
"Haven't seen" in option A is correct as the subject is singular. Hence, 'have' indicates subject verb agreement. "Haven't" is the contraction for "have not". This action is continuing through the week.
"Didn't see" in option B is incorrect as the verb form 'see' is incorrect and is in tense disagreement with the sentence.
"Am not seeing" in option C is incorrect as it is in continuous tense and does not follow the rule of verb tenses.
As option A is correct, so "none of these" in option D is void.