Which statement about strong acids is true

Which statement about strong acids is true?
    
 a.
Strong acids are weak electrolytes.
 b.
Strong acids are very concentrated.
 c.
Strong acids are mostly converted to ions when dissolved in water.
 d.
Citric acid is a strong acid.
 e.
Strong acids react only with strong bases.



Which traits make for the best fuel?
    
 a.
low fuel value and high energy density
 b.
high fuel value and low energy density
 c.
weak bonds in the fuel and weak bonds in the combustion products
 d.
weak bonds in the fuel and strong bonds in the combustion products
 e.
strong bonds in the fuel and strong bonds in the combustion products