I think the answer is number 3
C is the best Awnser to choses
Usually, percent yield is lower than 100% because the actual yield is often less than the theoretical value. Reasons for this can include incomplete or competing reactions and loss of sample during recovery. Percent yield is always a positive value. I hope this can help you
Physically- say their is a block in a road like a crash they change direction to go around.
OR
Mentally- if their is two paths one of right and the other if wrong they may make a bad decision and is on the path of wrong but they want to change. In doing so they are changing direction.
Living things change direction because its normal it keeps things going.
dose this help??