Answer:
A
Explanation:
A uses a past tense (rang) which is correct for a past tensed sentence
Mean while B uses a present tense (ringing) for a sentence which is past tensed, which makes no sense and is absolute non sense.
De rien... au revoir avec des baisers!
The primary problem is the greenhouse effect. Greenhouse effect is when some gases (including CO2) absorbs some portion of sun's heat to make the atmosphere warm to support life. But when the amount of CO2 etc. increases in the atmosphere, it heats up more than it is required. So, by limiting CO2 emission, we can solve this problem.
I would assume C. Management
So basically the answer is true
