Question

Select the error-free sentence.

1.The speakers reliance on notes made the question-and-answer session dull.
2.The speaker's reliance on notes made the question-and-answer session dull.
3.The speakeres reliance on notes made the question-and-answer session dull.
4.The speakers' reliance on notes made the question-and-answer session dull.

Answer 1

2 is right, the other choices either don't use the possessive apostrophe right or they don't use it at all