Answer:
There are at least two external conflicts at work:
man versus machine
parents versus children
either one works
Explanation:
Hey, the answer that best fills in the blank would be B.) Subordinate Conjunction.
When joining two independent clauses with a comma, a subordinate conjunction needs to accompany the comma.
Petrie 3
Egypt. Kissinger 4
Weigall 1
Egypt a study 5
Roman 2
Tyldoswly 7
Britannica inc 6