Question

select the simple subject. mrs. williamson placed a pink and orange candle on the mantel.

Explanation:

The simple subject is the main noun or noun phrase that the sentence is about, excluding any modifiers. In the given sentence, "Mrs. Williamson" is the main entity performing the action (placed), and there are no modifiers attached to this noun phrase that would be separated from the core simple subject.

Answer:

Mrs. Williamson