If object a is placed on the ph scale at ph = 3 and object b is placed at ph = 8, which of the following must not be true?

a. object b has a higher hydroxide ion concentration than object a.
b. object b is closer to a neutral ph than object a.
c. object a is an acid and object b is a base.
d. object a has a lower hydronium ion concentration than object b.

i am guessing answer b. what do you guys think?

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-