Quick answers
Riddle 1: White (tree)
Riddle 2: Blue (bee)
Riddle 3: Orange (paper)
Riddle 4: Blue
Pick wrongly you receive a 5 minute duration debuff called "You have chosen... poorly" for -50% run speed.
Correct choice you receive a 5 minute duration buff called "Protection from spookiness" that bypasses all movement impairments from surprises in that area.