The correct option is A Front
The taste buds for "sweet" are on the tip of the tongue; the "salt" taste buds are on either side of the front of the tongue; "sour" taste buds are behind this; and "bitter" taste buds are way in the back.
As the jaggery is sweet in taste, the front part of the tongue detects the taste of jaggery.
So, the correct answer is 'front'.