Explanation:

The Antarctic ozone hole — one of the deepest, largest gap in the ozone layer in the last 40 years — has closed, according to World Meteorological Organization (WMO).

Ozone Hole

• An ozone hole is the thinning of the ozone layer boosted in size by colder temperatures.
• The Antarctic ozone hole is a naturally occurring phenomenon, first discovered in 1985, that typically opens up each year from August to December.

By the end of December, ozone levels return to normal.
Causes

• The formation of ozone hole in the Antarctic has been an annual occurrence and has been recorded for the last 40 years.
• The expansion of the hole was driven by a strong, stable and cold polar vortex and very cold temperatures in the stratosphere.

Human-made chemicals migrate into the stratosphere and accumulate inside the polar vortex.
Polar Vortex

• It is a large area of low pressure and cold air surrounding the Earth's North and South poles.
• The term vortex refers to the counter-clockwise flow of air that helps keep the colder air close to the poles.
• It weakens in summer and strengthens in winter.
• Often during winter in the Northern Hemisphere, the polar vortex will become less stable and expand, sending cold Arctic air southward over the United States with the jet stream.

Weakening of Polar Vortex

• As the temperatures high up in the stratosphere starts to rise, ozone depletion slows, the polar vortex weakens and breaks down. 
• By the end of December, ozone levels return to normal. 

Montreal Protocol

• The Montreal Protocol on Substances that Deplete the Ozone Layer regulates production and consumption of nearly 100 chemicals referred as Ozone Depleting Substances (OSD).
• Since the ban on halocarbons, the ozone layer has slowly been recovering, according to WMO.

Hence only statement 2nd is correct.