1. **State the problem:** Find how many seconds are in half of 4 minutes.
2. **Recall the conversion formula:** 1 minute = 60 seconds.
3. **Calculate half of 4 minutes:**
$$\frac{1}{2} \times 4 = 2 \text{ minutes}$$
4. **Convert 2 minutes to seconds:**
$$2 \times 60 = 120 \text{ seconds}$$
5. **Answer:** Half of 4 minutes is 120 seconds.
Therefore, the correct choice is **B 120**.
Half Of Minutes 91F86B
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