Achord can contain at most how many diameters?
a. 0
b. 1
c. 2
d. 3

 The correct answer is :  b. 1

Explanation:  The chord is a rectilinear segment that joins two points of a circle. The diameter is the maximum length chord. When the line passes through the center it is only possible to have a diameter. Therefore a chord can contain a diameter.

the king's decision.

themselves

an intensive pronoun is a pronoun that ends in self or selves, such as himself, herself, themselves, yourself, ourselves. since band members is a third person plural, the correct intensive pronoun would be themselves. if the band was talked about as a collective noun, itself would be the appropriate intensive pronoun. intensive pronouns are used to add emphasis to the noun it's modifying which is why it directly follows it.