CSI’s treatment of bidding and pricing mechanisms distinguishes between:

Alternates – for defined variations in scope or quality.

Allowances – for items not fully defined at bid time.

Unit prices – for work where quantities are uncertain or may change.

The question mentions:

Equal consideration and transparency during award

Flexibility while awarding

Managing cost during execution for undefined and unforeseen conditions

This language directly aligns with allowances and unit prices:

Allowances are used when the exact nature or selection of certain items (e.g., finishes, special equipment, or yet-to-be-selected products) is not fully defined at bid time. An allowance amount is stated in the documents so all bidders include the same amount, ensuring comparable bids and transparency. Actual cost is reconciled during construction.

Unit prices are used when work items have uncertain quantities (e.g., rock excavation, unsuitable soil replacement). The unit rate is bid up front, and final payment is based on actual measured quantities, which allows the owner to manage cost fairly during execution when unforeseen conditions arise.

Together, allowances and unit prices (Option C) ensure that:

All bidders base their bids on the same assumptions, supporting equal consideration and fairness.

The contract can adapt to undefined or unforeseen conditions without renegotiating basic pricing structures.

Why the others are not correct:

A. Bid security and substitutionBid security protects the owner if the bidder fails to execute the contract; substitution deals with product changes. These do not primarily address managing costs for undefined or unforeseen conditions nor set flexible price structures like allowances or unit prices.

B. Add and deduct alternativesAlternates provide flexibility in award (selecting add or deduct options), but they deal with defined scope options, not ongoing management of undefined or unforeseen conditions during execution.

D. Liquidated damages and combined bidsLiquidated damages relate to time and schedule risk, not unknown scope or quantities; combined bids are procedural. Neither is the primary mechanism CSI associates with managing cost for undefined/unforeseen work.

Relevant CSI-aligned references (no URLs):

CSI Project Delivery Practice Guide – sections on bidding, pricing, alternates, allowances, and unit prices.

CSI Construction Specifications Practice Guide – discussion of Division 01 provisions for allowances and unit prices.

CSI CDT Body of Knowledge – topics on bid forms, pricing mechanisms, and managing unknown quantities.