How many covalent bonds does and oxygen stone usually make in forming covalent compounds?
a) 5
b) 3
c) 2
d)4
e)1

Oxygen usually forms two covalent bonds or a covalent double bond.

Explanation:

A covalent bond is formed by the sharing of 2 electrons, 1 electron from each of the atoms sharing their electrons.

The number of bonds that each element can form depends on the number of valence (outermost) electrons it contains. Oxygen has 6 electrons in its valence shell and needs 2 more electrons thereby forming a double bond.

it is b that is the answer.