The correct option is B 1 Ω
If we cut a 16 Ω resistor into four equal parts, and if its resistance is uniformly distributed across its length, we will get four 4 Ω resistors.
Now if these four 4 Ω resistors are connected in parallel, the effective resistance would be:
1Reff=14+14+14+14
⇒Reff=1 Ω.