While many different techniques can be used to rate or score proposals, all will use one of the following ;-?

Option C is my answer,

These two options are mentioned in PMBOK,  and practically in some situations screening system is not used.

A proposal  is evaluated based on weighted score of technical and financial score. The technical evaluation will take care of all regulatory compliance, management of the company and content  of the proposal. Financial evaluation shall be based on  offered price  only.

Then only technically compliant proposal are taken into account  and a combined score is arrived based on established weighting formula mentioned in the bid document. 

So, Option C is the best choice

correct answer is (C) :Expert judgment is a tool and technique used in the conduct procurements process. It, along with some form of proposal evaluation techniques as developed during the plan procurements process and noted as source selection criteria, is used to rate and score proposals. This does not preclude the use of other tools and techniques, but these tools and techniques are used in all evaluations

Correct answer is C :  Expert judgment and some from of proposal evaluation techniques 

I will choose option (B) A weighting system with conjunction with A screening system

I agree that the correct one should be 

b - A weighting system with conjunction with a screening system

I agree, B seems the most likely answer, though C would add tremendous value to the process.

I choose to opt (b)- A weighting system with conjunction with A screening system.

screened proposals can be proceeding for rating using weighing system which is based on different on aspects like  projects compliance, etc. so i feel options (a) , (c) and (d) are already part of screening and weighing system. so the right option is (B). Thanks.