Step 1: Read what is asked.
The question wants the number of farm universities running in India right now.
Step 2: Check the real count.
India has a large farm education system. It includes State Agricultural Universities, Central Agricultural Universities, Deemed Universities and central universities with farm faculties. Put together, the count is well above 74.
Step 3: Match with the options.
The given numbers 48, 49 and 50 are all far too small. Since none of them fits the real figure, the correct choice is None of these.
\[ \boxed{\text{None of these}} \]