Concept:Prepositions for days and specific times:
on is used with days and dates,
at with precise clock times,
in with longer periods (months, years), and
along indicates movement beside something.
Explanation:The sentence refers to a particular morning on a specific day of the week (Friday morning).
We need a preposition that shows the time when the meeting will happen.
Option A –
in is incorrect because it is used for months, seasons, or longer durations (e.g., “in the morning” as a general time, but not when a specific day is named).
Option C –
along is wrong; it suggests moving together beside something (e.g., “walk along the road”), not a time reference.
Option D –
at is possible for exact clock times (e.g., “at 9 a.m.”) but not for a morning that is tied to a day name; “at Friday morning” is unnatural in standard English.
Option B –
on is the correct choice because
on is the standard preposition with days of the week and with “day + morning/afternoon/evening” (e.g., on Monday morning, on Friday afternoon).
Thus, the correct phrase is “on Friday morning,” meaning the specific Friday morning.
Answer:Option B –
on.