Under normal conditions air moves from pressure system to a pressure system

Under normal conditions air moves from higher pressure system to a lower pressure system
Air moves to lower pressure. This concept can be observed in the lungs and heart. When you trying to inhale, the muscle in ribs or diaphragm will pull the rib cage and decrease its pressure up to -1mm Hg. This will cause the air from atmosphere enter the lungs. 
In expiration, the muscle will relax and the air pressure inside lungs will become +1 mm Hg, makes the air pushed out.

starchy vegetables are high in carbohydrates.

starchy vegetables contain more carbohydrates than non-starchy vegetables.

explanation:

there are two primary categories of carbohydrates, essentially differentiated on the basis of their carbohydrate content (which is in the form of starch - a complex carbohydrate):

starchy vegetablesnon-starchy vegetables

those vegetables which contain little amounts of starch are termed as non-starchy vegetables, and some examples include: artichokes, broccoli and bean sprouts.

vegetables high in their starch content are distinguished as starchy vegetables, and some examples include: potatoes, chickpeas and corn.

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The answer is b, as with an inference you make a statement with no evidence