Correct option is C
Statement I: Using 3D printers, prosthetic limbs can be made to exactly fit the recipient.
This statement is true, as discussed above.
Statement II: OLEDs consume more power than LCD/LED formats and thus produce more heat.
This statement is false. OLED displays are actually more power-efficient than LCD/LED displays, meaning that they consume less power and produce less heat.
Based on the above explanation, the correct answer is (c).