Which of following is a key factor affecting the productivity of agriculture in Pakistan

Which of following is a key factor affecting the productivity of agriculture in Pakistan

مندرجہ ذیل میں سے کون سا پاکستان میں زراعت کی پیداواری صلاحیت کو متاثر کرنے والا کلیدی عنصر ہے۔
Explanation

Agriculture is considered the backbone of Pakistan's economy

Pakistan's principal natural resources are arable land and water.

Agriculture accounts for about 18.9% of Pakistan's GDP

The most agricultural province is Punjab