Ivan, a scientist, invented a method of using solar energy to power electrical devices. However, the cost of using the method on a large scale was...

  Ivan, a scientist, invented a method of using solar energy to power electrical devices. However, the cost of using the method on a large scale was prohibitive. Hence, his invention wasn't adopted by his target customers. The lack of _______ was the reason for the failure of his invention. 

       A. economic viability   B. technological feasibility   C. organizational suitability   D. social adaptability