Final answer:
The correct answer is option c. Singular things exist within God as expressions or modifications of divine attributes but do not possess the same infinite and necessary nature as those attributes.
Step-by-step explanation:
Singular things in Spinoza's Ethics refer to individual entities or objects. According to Spinoza, these singular things exist within God as expressions or modifications of divine attributes. However, they do not possess the same infinite and necessary nature as those attributes. While modes are infinite expressions of God's attributes, finite modes, or singular things, display limitations in their existence compared to the attributes themselves.
For example, let's consider a tree. The tree is a singular thing, a finite mode, that exists within God as a modification of one or more attributes. However, the tree is not infinite and necessary like the attributes themselves. It is dependent on other factors for its existence, such as sunlight, water, and soil.
Therefore, although it exists within God, it does not possess the same infinite and necessary nature as God's attributes.