Answer:
The correct answer is third option
 1/√3
Step-by-step explanation:
From the figure we can see a right angled triangle ABC.
Right angled at C.
AB = 10
AC = 5
BC = 5√3
<u>Points to remember</u>
Tan θ = Opposite side/Adjacent side
<u>To find the value of tan(B)</u>
Tan B =  Opposite side/Adjacent side
  = AC/BC
  = 5/5√3
  = 1/√3
Therefore the value of tan(B) =  1/√3