Mbali Is Furious When She Gets Back an Exam That

Mbali is furious when she gets back an exam that she thought she should have done really well in.Instead, she receives a low C, and attributes it to roadworks involving heavy construction equipment going on less than 10 metres from the open classroom windows.Mbali's explanation relies on ____ factors.

A) internal, stable
B) external, stable
C) internal, unstable
D) external, unstable