The correct option is B is downloading
In order to find out the correct form of the verb needed, let's first understand these tenses. Present continuous tense is used to express an action that is continuing at the moment. Usually, in this case, the start time of the action isn't given. Present perfect continuous tense is used to express an action that has started in the past, continuing in the present, and might go on or end in future. Here, usually, the start or the end time of the action is given. The sentence uses the word 'now,' so we can understand that the action is continuing in the present and has no start and end time. We will use present continuous tense here. Hence option B is correct - 'Vineeta is downloading some information from the internet now.' Option A is incorrect as it doesn't have an auxiliary. Option C is incorrect as it is grammatically incorrect. Option D is incorrect as we can't use perfect continuous tense here.