BE MY BEST FRIEND The first recorded unexplained loss of bees was when?

a.

In the US 150 years ago

c.

This is the first unexplained loss

b.

More than 200 year ago in Britain

d.

Central Valley 50 years ago

im pretty sure its A notify me if its wrong

Explanation:

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.