The correct option is A Some
This is a positive sentence as there is no usage of the "no" word in the sentence. "Some" is used in positive sentences whereas "Any" is used in negative sentences. Since, this is positive sentence, Option A is the correct answer. The "dirt" mentioned in this sentence is an uncountable noun. "A" and "An" are only used when there is a countable noun. Thus, option B and C is incorrect. Option D is invalid as Option A is the correct answer.