JEE Main 1982 Mathematics question on Sequences and Series

1. A.
   $n\sum_{i=1}^{n} x_i^2 < \left(\sum_{i=1}^{n} x_i\right)^2$
2. B.
   $n\sum_{i=1}^{n} x_i^2 \geq \left(\sum_{i=1}^{n} x_i\right)^2$
3. C.
   $n\sum_{i=1}^{n} x_i^2 \geq n\left(\sum_{i=1}^{n} x_i\right)^2$
4. D.
   None of these

[1982]