Jon P. answered 03/13/15
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The Law of Syllogism says that if (A implies B and B implies C), then A implies C.
In this case:
A = The sun is shining
B = It is a beautiful day
C = We will have a picnic
The two statements they give you mean that A implies B and B implies C.
So the Law of Syllogism tells you that A implies C, or: If the sun is shining, then we will have a picnic. That's choice C.