The water entered the city from tunnels that were built under the city.
a.
simple
c.
compound-complex
b.
compound
d.
complex

clerical work ensures that an office runs smoothly. it involves the day-to-day administrative tasks of an office, such as answering phones, scheduling appointments, sending faxes, and filing documents. office clerks and secretaries need to have particularly strong clerical skills.

explanation:

see u later bae lol

i am also pretty sure it is c