When Were Most of the Existing Lava Plains Formed on the Surface

Multiple Choice

When were most of the existing lava plains formed on the surface of Mercury?

A) Never.There is no evidence of lava flows on the surface of Mercury.
B) When Mercury was first formed,about 4.5 billion years ago
C) At the end of the era of heavy bombardment,about 3.8 billion years ago
D) When the crust wrinkled to form the scarps