The correct spelling is-

ক. convence

- This spelling is incorrect. The word lacks the proper spelling of the "y" and "a" in "conveyance."

খ. convance

- This spelling is incorrect. It also lacks the proper spelling of the "y" and "a" in "conveyance."

গ. conveyance

- This spelling is correct. "Conveyance" is spelled with a "y" and an "a" as in this option.

ঘ. conviyance

- This spelling is incorrect. It includes an extra "i" between "y" and "a," making it a misspelling of the word.

In summary, option গ ("conveyance") is the correct spelling according to standard English spelling rules. It correctly spells "conveyance" as it is commonly accepted in English vocabulary.