Answer:
D 23.4 cm
Step-by-step explanation:
[tex] \frac{original \: photo}{reduced photo} = \frac{3}{2} [/tex]
[tex]original \: photo \: = \frac{3 \times reduced \: photo}{2} [/tex]
[tex]original \: photo \: = \frac{3 \times \: 15.6}{2} [/tex]
Original photo = 23.4 cm