The actual___by which coal is extracted is well worth watchingA pattern B process C procession D profession

The actual___by which coal is extracted is well worth watchingA pattern B process C procession D profession
The actual___by which coal is extracted is well worth watching
A pattern B process C procession D profession

The actual___by which coal is extracted is well worth watchingA pattern B process C procession D profession
B,译为：采煤的实际过程很值得一看
这四个选项里只有process具有过程的意思
pattern 模型、花样、图案
procession 队伍、行列
profession 职业、声明、行业