Which of the following is TRUE about formulae in Conjunctive Normal Form?
Which of the following is TRUE about formulae in Conjunctive Normal Form?

For any formula, there is a truth assignment for which at least half the clauses evaluate to true.

For any formula, there is a truth assignment for which all the clauses evaluate to true.

There is a formula such that for each truth assignment, at most onefourth of the clauses evaluate to true.

None of the above.
I am not able to understand the solution here
https://math.stackexchange.com/questions/663565/confusioninconjunctive...
Plzz provide some detailed explanation
Try to solve it using contradicting examples:
For any formula, there is a truth assignment for which at least half the clauses evaluate to true. // take AND of x and y in this 1/4 is true as when x=y=T , so statement is false
For any formula, there is a truth assignment for which all the clauses evaluate to true. // take OR of x and y ,it is never always T as x=y=F , so statement is false
There is a formula such that for each truth assignment, at most onefourth of the clauses evaluate to true. // take OR of x and y ,3/4 is true as and when any of x or y is T ,so statement is false
None of the above.
So, d is right answer.
Even this seems no intuitive to me.
How are you evaluating clauses to be half, 1/4, 3/4.
For second statement I got it that For any formula, there is no truth assignment for which all the clauses evaluate to true.