Read these sentences from the text.

“Next up at the driving school is the accident avoidance exercise. Students drive at highway speeds down a lane that splits into three lanes. Each lane has a signal light over it. At first, all three lights are green. Then, suddenly, one or more of the lights turns red, and students must immediately switch lanes to avoid an 'accident' ahead.”

What word or phrase could replace "At first" in the fourth sentence without changing the sentence's meaning?

instead
in particular
initally
later on

initially

The word "initially" could replace "At first" in the fourth sentence without changing the sentence's meaning.

To find a word or phrase that could replace "At first" in the fourth sentence without changing the meaning, we need to understand the context. In this case, "At first" indicates the initial state or condition of the lights. The purpose is to highlight the change that occurs later on.

To replace "At first," we are looking for an option that conveys the same idea. Let's evaluate the given options:

1. Instead: This word indicates a choice or alternative. It does not properly convey the concept of the initial state or condition.
2. In particular: This phrase is used to specify or emphasize something specific, but it doesn't convey the idea of a sequence or change.
3. Initially: This word accurately expresses the beginning or initial state, and it can be used as a suitable replacement for "At first."
4. Later on: This phrase refers to a subsequent point in time, not the initial state that "At first" represents.

Therefore, "initially" could replace "At first" in the fourth sentence without changing its meaning.