Which acts as a negative catalyst?

A positive catalyst increases the rate of the reaction by providing an alternate pathway of lower activation energy.
On the other hand, a negative catalyst decreases the rate of reaction by increasing the activation energy of the catalyst.
The following acts as negative catalysts:
(A) Lead tetraethyl as antiknock compound.
(B) Glycerol in decomposition of $H_2{O}_2$.
(C) Ethanol in oxidation of chloroform.