Explanation:

At the COP26 summit in Glasgow in 2021, India's Prime Minister Narendra Modi pledged that India would achieve net-zero carbon emissions by the year 2070 (B). This commitment was a significant part of India's climate action strategy. The years 2050 (A), 2060 (C), and 2080 (D) are not the officially declared target year for India's net-zero emissions. Hence, (B) is the correct target year.