What other words in the selection connect to this concept of the seventh man ?

The correct word to complete the sentence

They always say that juvenile delinquency is a problem. a.)them b.)everyone c.)a noun

Read the following entries from the online etymology dictionary based on the information above, what does the world microcephaly most likely mean? a. dull or unintelligent b. worldly thinking c. having a large head d. bigger than usual