All of the following are factors that affect metamorphic processes except

a. temperature.
b. deposition of new layers of sediment.
c. pressure.
d. mineral composition of the parent rock.

All of the given are factors that affect "metamorphic processes" except "deposition of new layers of sediment".

Explanation:

The chemistry of metamorphic rock is same as its parent rock. Example quartz will metamorphose into silica. Limestone will metamorphose into calcium rich rock. Temperature and pressure are the important factors which affect metamorphic processes. Minerals are formed under different temperatures and pressures. The chemical reactions also occur at various temperatures during metamorphism.  

Exploration mission 2;

Ithink the answer is either a , c or d