Given:
The mass of one student is,
[tex]m_1=72.5\text{ kg}[/tex]
The mass of the other student is,
[tex]m_2=80.0\text{ kg}[/tex]
The distance between them is,
[tex]d=1.25\text{ m}[/tex]
The gravitational force between them is,
[tex]F=G\frac{m_1m_2}{d^2}[/tex]
Here the gravitational constant is,
[tex]G=6.6\times10^{-11}\text{ }\frac{N.m^2}{\operatorname{kg}}[/tex]
Substituting the values we get,
[tex]\begin{gathered} F=\frac{(6.6\times10^{-11})\times72.5\times80.0}{(1.25)^2} \\ =2.5\times10^{-7}\text{N} \end{gathered}[/tex]
Hence the second option is correct.
