Incorrect Answer.
This sentence is rather complex.
If
p means 'The traffic is heavy'
q means 'It rains'
r means 'He is in a bad mood'.
We could think of 'Heavy traffic and rain put him in a bad
mood.' as some sort of universal implication,
saying that heavy rain and traffic always put him in a bad mood. The
logical structure of this sentence would then be p 
q 
r. However, if r means 'He was put in a bad mood',
then the structure of the sentence could be p q r. But no matter
what meanings we choose for p, q, and r, this sentence does not have
the structure p 
(q r).
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