Step 1: Place a colloid between two extremes.
A colloid is a middle ground between a true solution, whose particles are very small, and a suspension, whose particles are very large.
Step 2: Recall the true solution limit.
In a true solution the dissolved particles are smaller than $1$ nm, so small that they neither scatter light nor settle.
Step 3: Recall the suspension limit.
In a suspension the particles are bigger than about $1000$ nm, large enough to settle out on standing and even be filtered off.
Step 4: Fix the colloidal window.
Colloidal particles lie just between these limits, roughly from $1$ nm up to $1000$ nm.
Step 5: Match with the options.
Option 1, $1$ to $1000$ nm, fits this range exactly. The other options begin at $1000$ nm or higher, which describes suspensions, not colloids.
Step 6: Confirm with a property.
This intermediate size is exactly why colloids show the Tyndall effect and Brownian motion, supporting our choice.
\[ \boxed{1 \text{ to } 1000 \text{ nm}} \]