What is the approximate signal propagation delay between two ground
stations when communicating via a communication satellite passing
directly overhead? Assume a satellite altitude of 743 statute miles.

 0.0028 sec 
 3.4 msec 
 4.0 msec 
 8.0 msec 
 Don't know. Not enough information

Assumptions:
Signal speed is the same as speed of light (ignore any small differences).
Ground stations are 743 miles from the satellite (for each station,
ignoring any slant range).
No delay introduced by the satellite repeater.

Calculation:
The signal has to travel from one ground station to the satellite to
the other ground station, so total travel distance is 2 x 743 = 1486
miles.

Light travels at about 186282 miles per second (or 5.368 microseconds
per mile, that is 1/186282, a microsecond is a millionth of a second).

So to travel 1486 miles, it takes 7996.8 microseconds (about 8.0 msec
from your answer list).