Question

Conjecture: Inference::
a. confer: talk
b. speak: statement
c. relate: relative
d. go: leave

Answer 1

Not sure, sorry.

Answer 2

The only one that seems unrelated (ironically) is C.)

Answer 3

Actually I would think B.
A conjecture is based off of incomplete evidence.
An inference is based off of complete evidence.

Therefore when it's like informal::formal

When you speak you're casually talking
But when you make a statement it's like a formal way of speaking.

For example employees of a company may speak about stuff but what they say doesn't represent the company they work for.
An employee of a company may make a statement for the company and that's like an official/absolute idea where medias or other people can cite.