Please answer this question about chemistry ASAP I NEED HELP

What is the value of keq for the reaction expressed in scientific notation

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

Which of these statements explains the difference between nuclear binding energy and the strong nuclear force ?