10
which sentence is written correctly?
a.
usually, a battery of tests are required to determine if a person has had a heart attack.
b.
in north america, a range of mountains are often home to a variety of plants and animals.
c.
a standard deck of playing cards contain a total of 52 cards that are used in various games.
d.
the dallas symphony orchestra, which was founded in 1900, warms up before each rehearsal.