Step 1: Recall what electric field means.
The electric field $E$ at a point tells us the force felt by each unit of charge placed there. By definition $E=\frac{F}{q}$. We use this because the field and the charge are given and the force is asked.
Step 2: Rearrange for force.
Multiply both sides by $q$ to make the force the subject. \[ F=qE \] This says: stronger field or bigger charge gives a bigger force.
Step 3: Write the given data.
The field is $E=30\,\text{N/C}$ and the charge is $q=20\,\text{C}$.
Step 4: Substitute the values.
Put both numbers into $F=qE$. \[ F=20\times 30 \]
Step 5: Do the multiplication.
Multiply carefully. \[ F=600\,\text{N} \]
Step 6: State the answer.
The charge feels a force of $600\,\text{N}$, which is option 1. The other choices come from forgetting to multiply both numbers together. \[ \boxed{600\ \text{N}} \]