In each question, select the correct option that combiner the two sentences without changing their meaning. The boys are playing in the garden. It is raining.

• A.  The boys are playing in the garden since it is raining.
• B.  The boys are playing in the garden although it is raining.  
• C.  The boys are playing in the garden if it is raining.
• D.  Unless it is raining, the boys are playing in the garden.