<span>A. Misplaced modifier
The sentence could have been structured as, "</span>The man, who dedicates long<span> hours in the lab</span>, is a scientist with a keen sense of observation."
This reconstructed sentence is accurate and grammatically sensitive that the former proposed.
I would say the best answer is A, he hides behind a tree. I was in between A and D, but one can run in a park.
B wouldn't work because him being dressed in ordinary street clothes doesn't show that he's afraid of something.
C wouldn't work because although yes, he was panting, that could mean that he's just tired; not necessarily, scared.
The man hiding behind the tree is the best evidence for the conclusion of him being afraid of something. Also in the passage it states, "....he moved behind a tree. Seeming not to notice my presence, he stood with his back against the trunk, panting."
It depends. Are you saying Ouch! That hurts! I so, then it's exclamatory. You are exclaiming or shouting. Hope it helps!
“It the tree was connected with a tragical story....” probably wrong but seems pretty right to me
