Step 1: Recall what the Human Development Report covers.
It ranks and compares countries using indicators like life expectancy, education levels and income, through the Human Development Index.
Step 2: Identify who publishes it.
This report is brought out every year by the United Nations Development Programme, not by the WTO, WHO or UNEP, which focus on trade, health and environment respectively.
Step 3: Final answer.
Hence, the Human Development Report is published by the United Nations Development Program, option (D).