Why Will Metamorphic Rocks Found in a Contact Metamorphism Aureole

Why will metamorphic rocks found in a contact metamorphism aureole be nonfoliated?

A) Because the main agent of metamorphism is heat, which will result in intergrown crystals
B) Because the pressures involved with contact metamorphism destroy foliated crystals
C) Because the temperatures associated with this are too low to alter the rock
D) Because the velocity of the hydrothermal fluids will carry foliated materials away