Answer
The correct answer is (c) 4/3
Work Step by Step
The original volume of the box is $V = LWH$
The new volume of the box is:
$V_2 = (L/3)(2W)(2H) = 4/3 \times LWH = 4/3 \times V$
The volume has changed by a factor of 4/3
The correct answer is (c) 4/3