Correct Answer: High

Solution : The correct option is High.

"High" is represented by the letter "H" in HYV in the context of the Green Revolution. The acronym for High-Yielding Variety is HYV. Crop varieties that have been produced through selective breeding to yield more than traditional types are known as high-yielding varieties. During the Green Revolution of the mid-20th century, the introduction of HYVs and the use of contemporary agricultural techniques significantly increased agricultural productivity and food production.