Discussion
A plane passing through the apex of a cone gives, in the general case,
Answer: A
Correct answer: two intersecting straight lines
A plane through the apex meets the surface in generators rather than in a curve. In the general case it cuts two of them, giving a pair of straight lines crossing at the apex; tangential to the cone it gives one; and passing through the apex without entering the cone, only the apex itself. These are the degenerate conics.
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