Explanation:

• Lead poisoning is affecting children on a massive and previously unknown scale, according to a new report launched by UNICEF and Pure Earth.
• The report, the first of its kind, says that around 1 in 3 children – up to 800 million globally – have blood lead levels at or above 5 micrograms per deciliter (µg/dL), the level at which requires action.
• Nearly half of these children live in South Asia.
• The report, The Toxic Truth: Children’s exposure to lead pollution undermines a generation of potential, is an analysis of childhood lead exposure undertaken by the Institute of Health Metrics Evaluation (IHME) and verified with a study approved for publication in Environmental Health Perspectives.

Hence option 3rd is correct.