Question

you snooze, you lose
are you a morning person? if you lived in great britain and ireland during the late 1800s and early 1900s, you could get a job as a \knocker - up\. for a few pence, or british pennies, a week, a knocker - up would tap on people’s windows early in the morning to wake them for work.
knocker - ups usually tapped with a long stick, but they also shot pebbles or peas at windows on higher floors. today, alarm clocks or phone alarms wake people up.
why are there no knocker - ups today?
they charged too much money.
they damaged people’s windows.
they were replaced by alarms.
they woke people up too early.

Explanation:

El texto explica que los "knocker - ups" eran reemplazados por relojes despertadores o alarmas de teléfono en la actualidad. Entonces, la razón por la que no hay knocker - ups hoy es que fueron reemplazados por alarmas.

Answer:

B. They were replaced by alarms.