Find the value of the variable y in the right trapezoid.
Choices:
A:10
B:20
C:30
D:70
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: Find the value of the variable y in the right trapezoid.
Choices:
A:10
B:20
C:30
D:70
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: Find the value of the variable y in the right trapezoid.
Choices:
A:10
B:20
C:30
D:70