The correct match for each agricultural product to its foremost producer is the basis of this question.

Option 1: I-B, II-A, III-D, IV-C implies Cotton`s foremost producer is Gujarat, Gram`s is Madhya Pradesh, Black pepper`s is Kerala, and Pineapple`s is West Bengal. This is accurate because Gujarat leads in cotton production in India, Madhya Pradesh in gram, Kerala in black pepper, and West Bengal in pineapple.

Option 2: I-B, II-A, III-C, IV-D suggests that Black pepper`s foremost producer is West Bengal and Pineapple`s is Kerala, which is incorrect since Kerala is the foremost producer of Black pepper, not Pineapple and vice versa for West Bengal.

Option 3: I-A, II-B, III-D, IV-C implies Cotton`s foremost producer is Madhya Pradesh and Gram`s is Gujarat, which is also incorrect. Gujarat, not Madhya Pradesh, is the largest producer of Cotton, and Madhya Pradesh, not Gujarat, leads in Gram production in India.

Option 4: I-A, II-B, III-C, IV-D makes the same incorrect assumptions as described in option 3 and 2.

Hence, option 1 is the correct answer.