The correct option is B The
Articles are of two types: definite and indefinite. 'The' is a definite article which is used when it precedes a noun which is a specific member of a group. In the given statement, the guide is a specific person being spoken about, which is why Option A is the correct answer. 'A' and 'an' are indefinite articles which refer to any member of the group, rather than a specific member. So that rules out Options C as well as D for the given statement. In cases where a proper noun is being used, or a statement is being made in general, an article is not required. Since the guide being spoken about is a specific member, Option B is the incorrect answer.