Final answer:
Deep cuts in global emissions are necessary to keep global warming below a critical threshold of 2 degrees Celsius, which is aimed at avoiding major climate-related catastrophes. The correct option is C.
Step-by-step explanation:
Deep cuts in global emissions are required to hold global warming below 2 degrees Celsius. Most climate experts and international agreements, such as the Paris Agreement, recommend limiting global warming to this threshold to avoid catastrophic impacts on both natural and human systems.
To achieve this target, substantial measures, including promoting the use of renewable energy, increasing carbon sequestration through reforestation, and reducing the consumption of fossil fuels, are critical.
The direct answer to the student's question is C) Hold global warming below 2 degrees Celsius. This is in line with global efforts by national governments and international organizations to mitigate climate change by adopting resolutions that advance renewable energy resources, and engaging in practices aimed at controlling greenhouse gas emissions.