Only one plane can contain three specific points.
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Infinitely many planes contain any two given points- it takes three (non-collinear) points to determine a plane.
Exactly one.
Anything that contains the line must contain every point on the line, so "a point on the line" doesn't give us any more information. You're just asking how many planes can contain the line. Now imagine setting a wood panel down on a tight-rope. How many different ways can it set there before it falls off ? A lot, right ? An infinite number of planes can all contain your line. (And all of its points.)
Three non-co-linear points are sufficient to uniquely define a single plane.
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