This part of the electromagnetic spectrum produces heat and with special equipment can locate people at night

infrared waves
microwaves
x-rays
gamma waves

Option A, Infrared waves

Explanation:

Infrared waves

Infrared radiations (IR) are the radiation that lies in the wave length range of 700 nanometers to 1 millimeter. However its frequency is the shortest

The wavelength of IR is higher than the visible light and hence it is invisible but it can be sensed as heat due to which they are used in thermal imaging and night vision equipment.  

Therefore, option A is correct.

your answer should be c) enjoy!

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.