A. 1/2
Explanation- There is a 5/10 chance of choosing on of the numbers which simplifies to 1/2
The first basic metals on the periodic table are alkali metals.
TL;DR: The make of an aircraft is the name of the designer (for example, Boeing) and the model of an aircraft (also called the type) is the designation for the general design of the aircraft (for example, 737). It looks like "basic model" is just an older term for "model".
