Correct

穷究

/ qíong jiū / 
Strokes

Example

As a Verb

make an exhaustive enquiry into sth; probe deeply into sth

1
Qíongjiū
穷究
qí
其
lǐ
理
  
/
qí
其
yīn
因

probe deeply into sth to find the cause

2
Qíongjiū
穷究
qí
其
gēn
根

probe the roots of sth