Correct

臆断

/ yìduàn / 
Strokes

Definition

to assume/assumption

Example

As a Verb

assume; suppose

1
Zhè
这
chúnshǔ
纯属
yìduàn
臆断
  
。

This is mere assumption.

2
Zhǔguān
主观
yìduàn
臆断

subjective assumptions

3
Zuōchū
作出
yìduàn
臆断

elicit surmises (from)