Demanding means to forceful towards someone, usually wanting for them to do something.
Certain means that someone is sure of something.
Confident is similar to certain, which is when someone is sure of something.
Assertive is when someone is direct when expressing their ideas.
The most negative of these would be A, Demanding.
C. His heart turned to stone.
Your heart turning into a stone isn't possible, so that is why it is a metaphor. It basically means being coldhearted.
The examples of complex sentences are :
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<em>Before you eat the sandwich, please cut it in half.
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<em>When we are ready to leave, we will send you a text message.
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<em>If she starts to get warm, Janna will turn on the air conditioner.</em>
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