The first man-made satellite was
A. Sputnik
B. Aryabhatta
C. GSLV
D. Voyager

Hint: Natural Satellite- A small planet which revolves around a larger one is called Natural Satellite.
Artificial Satellite- It is a satellite which is launched into space and orbits around a body in space.It is a man made satellite.

Complete step by step answer:There are two types of satellites which are natural and Artificial (or man-made). A man made satellite is a satellite that is launched into space and orbits around a body in space.Earth and Moon are the examples of natural satellites. The Earth rotates around the Sun and the Moon rotates around the Earth.
On October 4 1957, the Satellite Sputnik I was launched. The world's first artificial satellite which was about the size of (58 cm) and it weighed only 83.6 kg.
Thus, the Correct Option is A

Additional information:
The Man made satellites come in many sizes and shapes and have different pieces of instruments to perform different functions in space. The Satellites are built by engineers. It takes months and sometimes years to build. The satellites have to go through various tests to make sure the satellite can withstand the launch and the harsh environment.

Note:The Radio waves are used for communication by satellites to send signals to the antennas on the Earth and Then the Antenna captures those signals and processes the information that is coming from those signals. The Information can include: scientific data, the health of the satellite, where the satellite is currently located in space.