PLEASE PLS PLS ANSWER ASAP!!! WILL GIVE BRAINLIEST

Which of the following is not an examle of physical weathering?

a water freezing which causes rocks to expand and break down.

b Plant roots growing into gaps of rocks which causes rocks to break apart.

c When wind causes sediment to come into direct contact with other rocks which then
start to break down.

d Acid rain reacting with rocks