It’s c. Where the two planes intersect
Answer:

Decimal Form:

Step-by-step explanation:

Remove Parentheses: 

Multiply the numbers: 

Divide both sides by: 

Simplify:

Hope I helped. If so, may I get brainliest and a thanks?
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Your answer would be choice 3, because when all points of a line lie in a plane, the plain contains the line so the line can contain all of the points. Hope this helped. ;)