How was Lady Margaret Beaufort involved in english royal politics?

Question

A. she was marride to henry V1
B. Her son was the supporter heir to the English throne
C. Her father was the half-brother of Henry V1
D. She was marride to Henry Tudor who became Henry V11
My answer is ..A ?

Answer 1

I disagree.

http://www.luminarium.org/encyclopedia/margaretbeaufort.htm