That if you are speaking to someone through message or email or any written message it has no tone. You may say something with good intentions & someone may take it the wrong way.
The category of connective used in this sentence is show consequence.
Because the rain fell all day, the garden was wet - it is the consequence, the result.
The cerebral cortex is responsible for cognitive function, thoughts. My best guess would be letter C.
To maintain their credibility,the writers had to give specific examples---evidence--- of how they had been mistreated.
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