A circuit contains four light bulbs. One light bulb goes out but the other three stays it. This must be an)
circuit
A parallel
B Closed
C series
D open

It is a parallel connection

Explanation:

In parallel connection the

Cell is not easily used up because the cells share the total current generated together with all bulbs.

But a major problem is the bulbs must not be left together undisconnected to avoid exhaustion arising from short fall in the strength of one cell as this bounds to affect others

b.transmitters send radio waves, and receivers capture radio waves.

d. air pressure decreases as altitude increases.