C.Friction
This force develops only when two surfaces are in contact
<u><em>Jung Bahadur Rana (1903-134)</em></u>
ᴍᴜᴛɪʟᴀᴛɪᴏɴ ᴏꜰ ᴄʀɪᴍɪɴᴀʟꜱ ᴡᴀꜱ ʟɪᴍɪᴛᴇᴅ. ᴜɴᴍᴀʀʀɪᴇᴅ ɢɪʀʟꜱ, 35 ʏᴇᴀʀꜱ ᴏꜰ ᴀɢᴇ ɢᴏᴛ ʀɪɢʜᴛꜱ ᴏɴ ᴛʜᴇ ᴘᴀʀᴇɴᴛᴀʟ ᴘʀᴏᴘᴇʀᴛʏ. ʜᴇ ᴛʀɪᴇᴅ ᴛᴏ ᴀʙᴏʟɪꜱʜ ꜱᴀᴛɪ ᴀɴᴅ ꜱʟᴀᴠᴇʀʏ.
The 1879 flag was introduced by Georgia state senator Herman H. Perry and was adopted to memorialize Confederate soldiers during the American Civil War.[4]<span> Perry was a former colonel in the </span>Confederate army<span> during the war, and based the design of the flag on the </span>first national flag of the Confederacy, also known as the "Stars and Bars".[4]<span> Over the following decades, the flag was changed by adding, and then changing the "</span>charge<span>" on the flag.</span>
B.the scores are clustered together within the groups, which makes it more difficult to see difference between groups.
Answer:
PR, positive reinforcement. Hope this helps :}
