The control for a complementation test, which is often omitted, is the:
a. trans test
b. cis test
c. complementation hybrid
d. citron test
e. cis-trans test

b. cis test

Explanation:

A test that is used to determine if the mutation associated with a given phenotype is due to mutations in two different genes or due to different alleles of the same gene is called a complementation test.

A complementation test is also called as a cis-trans test.

If the mutations in a complementation test are located on the same position then the genes are termed as being on the cis position otherwise on the trans-position.

A cis test, that is if the genes are located on the same position serves as a control for the complementation test.

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high

very