The rain is so heavy that the team can’t continue their exploration of the magnificent mountains.

• A. 
  The heavy rain makes the exploration of the magnificent mountains harder.
• B. 
  If the rain isn’t heavy, the team can continue their exploration of the magnificent mountains.
• C. 
  The rain isn’t enough light that the team can’t continue their exploration of the magnificent mountains.
• D. 
  It is such the heavy rain that the team can’t continue their exploration of the magnificent mountains.