What was the first commitment period of Kyoto Protocol of 1997?

The correct option is 2008-2012.

Detailed Explanation:
The Kyoto Protocol is an international treaty that was adopted on 11 December 1997 in Kyoto, Japan, and officially entered into force on 16 February 2005. The protocol operationalizes the United Nations Framework Convention on Climate Change (UNFCCC) by committing industrialized countries and economies in transition to limit and reduce greenhouse gas (GHG) emissions in accordance with agreed individual targets.

To implement these targets, the Kyoto Protocol structured its emission reduction obligations into specific timelines known as "commitment periods":
1. First Commitment Period (2008-2012): During this period, 37 industrialized nations and the European Community committed to reducing their greenhouse gas emissions to an average of 5% below their 1990 levels.
2. Second Commitment Period (2013-2020): Adopted via the Doha Amendment in 2012, this phase saw parties committing to reduce greenhouse gas emissions by at least 18% below 1990 levels over the eight-year period from 2013 to 2020.

Thus, the first commitment period of the Kyoto Protocol of 1997 spanned from the year 2008 to 2012.