Congestion pricing - Independent Clause?

[arpanchandra]

According to psychologists, many dieters subconsciously prefer a diet plan whose effectiveness is uncertain -- a consideration that, in case of failure, lets them blame the supposed ineffectiveness of the plan rather than their own lack of self-control.



A)a diet plan whose effectiveness is uncertain -- a consideration that, in case of failure, lets them blame the supposed ineffectiveness of the plan rather than their own lack of self-control

B)an uncertain diet plan in terms of effectiveness: such plans allow them to believe that the supposed ineffectiveness of the plan is to blame, rather than that they lack self-control in case of failure

C)diet plans with uncertain effectiveness, which will allow them to blame the supposed ineffectiveness of the plan, rather than to lack self-control, in case of failure

D)uncertainly effective diet plans, allowing them to believe the plans that are supposedly ineffective, rather than that they lack self-control, in case of failure

E)diet plans uncertain in effectiveness; in case of failure, allowing them to believe that the plan itself is ineffective rather than that they lack self-control

On a similar note : the explanation of option E :
" In this choice, the portion following the semicolon ("allowing them to believe...") is a modifier, not a complete sentence. A semicolon must be followed by an independent clause (a complete sentence) containing both a subject and a verb."

Why in option E - 'is ineffective' - not a verb?
and why it is not an independent clause?

[arpanchandra]

Any Help on the above post !!

Thnks

[jlucero]

"is (verb) ineffective (adj)" does include a verb, but it's within a subordinate clause:

in case of failure, allowing them to believe (that the plan itself is ineffective rather than that they lack self-control)

You can say "allowing your significant other to believe (that they are right) is sometimes necessary for a healthy relationship" but you need that second verb to complete the sentence.