As a result of various plant breeding techniques for the development of high-yielding varieties of wheat and rice in the mid-$1960$s, there was a dramatic increase in food production. This phase is called $Green Revolution$.
$\quad\quad P \quad Q$

• A
  $1960$ Blue Revolution
• B
  $1960$ Green Revolution
• C
  $1950$ Blue Revolution
• D
  $1950$ Green Revolution