How did Einstein Develop his Field Equations? When: A. He admitted having little math

How did Einstein Develop his Field Equations?
When:
A. He admitted having little math and no ability in non-Euclidean
geometry.
B. He always relied on someone else to do his math.
C. He denied getting it from Hilbert.
D. He never said who he got it from.
Answer:
He stole them from Hilbert.