His hand came up almost automatically to rest on her arm , a silent acknowledgement , and then gave a brief squeeze of affection . The cords of his hair were both springy and coarse against the sensitive tips of her breasts . His skin was cool from the morning air , but his inner furnace warmed her quickly . Resting her chin on his shoulder , she noticed the empty bay below . The night before had been dark , all color erased by the moonlight .

Based on the preceding passage, choose your answer for question Why are they outside without wearing any clothes ?
OPT: a). The night before had found the two locked out of their house , where all the clothes were located . b). They had spent the night inside , but decided to go outside for the morning . c). They had spent the night outside , making love under the moonlight . d). None of the above choices .
The answer is:
c).