I would say that they shouldn't be surrounded by a lot of white space and should have clear captions. The question of white space is one of good presentation so the visual looks like an integral part of the whole topic and having clear captions is so that the visual is well explained what it is.
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number 7 ( C) its' means multiple possessions and its talking about BRAKES which means more than one brake, when something says it's that means singular possession, one person or thing owns it and Its with no apostrophe, on the other hand, is the possessive word, like "his" and "her," for nouns without gender.
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One thing to unbalance a competitions odds are Performance Enhancing Drugs.
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hope that this helps!