Mango variety which has not received a GI tag till date:

Correct option is B

The 'Malda' mango variety has not been awarded a Geographical Indication (GI) tag to date. The other varieties listed have received GI tags:
Kishanbhog: This variety from West Bengal has been granted a GI tag.
Khirsapati: Also known as Himsagar, this mango from West Bengal has received a GI tag.
Laxmanbhog: This variety from West Bengal has been awarded a GI tag.
Therefore, among the options provided, 'Malda' is the only variety that has not received a GI tag.