Final answer:
The least important duty of an insurance adjuster is making sure the claimant is happy with the settlement amount.
Step-by-step explanation:
The LEAST important duty of an insurance adjuster is D. Making sure the claimant is happy with the settlement amount. While it is important for the claimant to have a satisfactory experience, the primary focus of an insurance adjuster is to fulfill their fiduciary duty to their employer by providing a fair and equitable settlement for the policyholder, and executing a thorough investigation of the claim.