Scientists around the world have been working for decades on perfecting the process of nuclear fusion in the lab. which statement justifies this research?

Scientists are looking for a way to create cheap, safe, and sustainable energy.
Nuclear fusion is the process by which two atoms rapidly collide at each other forming a new nucleus. The energy of colliding and synthesizing has intrigued scientist into believing that this could be one of best sources of renewable energy. 

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.