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Large petrochemical projects that involve multiple sets of process units generally go through a phase of overall design. Which of the following statements is correct regarding the tasks of this overall design? (A) Selecting technical solutions for the process units, with the aim of ensuring that the chosen technologies are advanced and reliable. (B) Further defining and standardizing engineering design criteria, principles, and technical requirements; optimizing the overall layout of the plant; improving the design of utility systems; and achieving control over the project’s overall process flow, layout, staffing levels, schedule, and cost. (C) Conducting forecasts of market demand and supply for the products, determining the scale of construction as well as the product portfolio, the overall process flow, and the overall material balance; and securing supplies of raw materials and fuel. (D) Establishing design principles, technical standards, and design foundations to ensure the quality of the project construction. Define the division of labor and technical interfaces, as well as the preliminary scale and layout plans for utility systems and auxiliary facilities, along with the methods for estimating costs. Establish the principles for integrating production units, systematizing the overall plant process, and organizing the utility systems within the plant ； Identify the social resources to be relied on and determine the basic data for design: clarify the requirements that must be met in terms of environmental protection and safety regulations, as well as the requirements regarding total pollution emissions and the installation of environmental protection and safety facilities; standardize technical specifications and applicable regulatory requirements; unify the basic design parameters (such as weather conditions, geological conditions, design parameters for utility systems, specifications for raw materials and auxiliary materials, etc.). Is option A – “selecting technical solutions for the process equipment” – part of the overall design phase or the preliminary design stage, or rather part of the feasibility study phase? Is this option incorrect, and if so, is it due to the use of the word “further”? Does C fall under the feasibility study phase? And isn’t “determining design principles and technical standards” part of the preliminary design phase? So D is also wrong. I really don’t know what to choose for this question; please help