Which of the Following Is the Best Arrangement When Taking

Which of the following is the best arrangement when taking a walk with young children?

A) Children form two horizontal lines with one adult in front of the lines and another adult in back; no one holds hands.
B) Children form a vertical line with one adult at the front; no one holds hands.
C) Children form two horizontal lines with one adult in front of the lines; children hold hands.
D) Children form a vertical line with one adult at the front and another adult at the back; everyone except the leader holds the hand of the person in front.