Substituting capital equipment in place of direct labor can be economically justified for scenario A, where volumes are forecasted to increase. This is because capital equipment can provide higher productivity, efficiency, and quality than direct labor, especially for large-scale and standardized production. Capital equipment can also reduce labor costs, such as wages, benefits, and training, and avoid labor shortages or turnover. However, capital equipment also involves high initial investment, maintenance, and depreciation costs, and may require more skilled workers to operate and monitor. Therefore, the substitution of capital equipment for direct labor should be based on a careful analysis of the trade-offs between the costs and benefits of both alternatives.

Option B is not correct, because material prices are forecasted to increase. This scenario does not directly affect the decision to substitute capital equipment for direct labor, as both alternatives use the same materials. However, increasing material prices may reduce the profitability of the production, and may require the company to find ways to reduce material usage, such as improving material yield, reducing scrap and rework, or sourcing from cheaper suppliers.

Option C is not correct, because implementing a pull system in production. This scenario does not favor the substitution of capital equipment for direct labor, as a pull system is based on the principle of producing only what is needed by the customer, when it is needed, and in the quantity needed. A pull system requires flexibility, responsiveness, and adaptability to the changing customer demand, which may be better achieved by direct labor than capital equipment. A pull system also aims to minimize inventory, waste, and overproduction, which may reduce the need for capital equipment.

Option D is not correct, because functional layouts are being utilized. This scenario does not support the substitution of capital equipment for direct labor, as functional layouts are based on grouping similar or related processes or machines together, regardless of the product flow. Functional layouts may result in long and complex material flows, high transportation and handling costs, high work-in-process inventory, and low visibility and coordination of the production. Functional layouts may also require more direct labor to move and monitor the materials and machines. Capital equipment may be more suitable for product layouts, where the processes or machines are arranged according to the sequence of operations for a specific product or family of products.