Step 1: Understand Clark’s formula.
Clark’s formula is used to calculate the pediatric dose based on the child’s weight. The formula is:
\[
\text{Child's Dose} = \frac{\text{Weight of child (lbs)}}{150} \times \text{Adult Dose}
\]
Step 2: Apply Clark’s formula.
The adult dose is 100mg, and the child's weight is 12Lbs. Plugging these values into the formula:
\[
\text{Child's Dose} = \frac{12}{150} \times 100 = 8 \, \text{mg}
\]
Step 3: Conclusion.
The correct dose for a child weighing 12Lbs is 8mg. Thus, the correct answer is (1) 8mg.