About not cancerous thyroid nodule

A patient says that she has recently noticed a lump in the front of her neck below her "Adam's apple" that seems to be getting bigger. During the assessment, what finding would lead the nurse to suspect that this may not be a cancerous thyroid nodule? Explain your answer with at least 200 words, minimum 1 scholarly reference in APA format within the las 5 years.

(the correct answer is B: It is mobile and soft)

a. It is tender.
b. It is mobile and soft.
c. It disappears when the patient smiles.
d. It is hard and fixed to the surrounding structures.