The mother said “I will pick you from school if I could”

The mother said "I will pick you from school if I could"
A: The mother said that she would pick him if she could
B: The mother said that she would picked him if she could
C: The mother said that she will pick him if she could
D: None of these

Indirect speech shifts will to would for conditional past. Others have tense errors. For reporting conditional statements in narratives.