In how many ways 4 boys and 3 girls can be seated in a row so that they are alternative?  Choose the correct choice from the following choices:
A) 120
B) 144
C) 160
D) 210
E) 180

Rationale: "4 boys can be seated in 4 ! three girls can be seated in 3 ! required number = 4 ! 3 ! = 144 answer is b"
Answer: B