Ripening of fruits is hastened by which of the following gases ?

Ripening of fruits is hastened by which of the following gases ?

پھلوں کے پکنے کا عمل مندرجہ ذیل میں سے کس گیس سے ہوتا ہے؟
Explanation

Most fruits produce a gaseous compound called ethylene that starts the ripening process.