The figure below shows four types of nutrients that are absorbable by animal cells. 
Which of the above molecules could be absorbed by the digestive tract without further digestion by enzymes?
Definitions:
Activity-Based Costing
A costing methodology that identifies activities in an organization and assigns the cost of each activity to all products and services according to the actual consumption by each.
Overhead Cost
Expenses not directly tied to production but necessary for running the business, such as rent, utilities, and salaries for administrative staff.
Activity-Based Costing
An accounting method that apportions overhead and incidental costs to the respective products and services based on the specific activities involved.
Worker Recreational Facilities
Facilities provided by employers for employees' relaxation and leisure, aiming to improve morale and productivity.
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