The answer is: [D]: "higher" .
_______________________________________________________
Note:
_______________________________________________________
Choice: [A]: "more high"; — is grammatically incorrect at all costs.
_______________________________________________________
Choice: [B]: "highest" ; — is the "superlative" — NOT the "comparative".
_______________________________________________________
Choice: [C]: "more higher"; — is grammatically incorrect at all costs.
_______________________________________________________
Choice: [D]: "higher" — is the comparative form and is grammatically correct.
_______________________________________________________
Looking up the word the way you think it is spelt.
Answer: A paradox is a statement that contradicts itself, or that must be both true and untrue at the same time. ... But a key part of paradoxes is that they at least sound reasonable. They're not obvious nonsense, and it's only upon consideration that we realize their self-defeating logic. For example: This statement is a lie.
Explanation: