The correct answer is B. Karan.
An absolute assignment is a transfer of all of the rights and benefits under a contract. In this case, Mahesh has transferred all of his rights under the life insurance policy to Karan. This means that Karan is now the owner of the policy and will be the beneficiary of any claims.
Option A is incorrect because Mahesh is no longer the owner of the policy. Option C is incorrect because the payment will not be shared equally between Mahesh and Karan. Option D is incorrect because Karan is the owner of the policy and will be the beneficiary of any claims.