In the united states, a man usually gives a woman a diamond ring for her to wear on her left-hand ring finger when they become engaged to be married. however, one diamond distributor has developed the idea that women should wear diamonds on their right hands as well. marketing communications regarding the diamond right hand ring stress the independence of women and their ability to buy a diamond for themselves. one ad claims that a diamond on a left hand says "we," while a diamond on the right hand says "me." this diamond distributor is attempting to

expand the usage situation

Explanation:

The usage situation -

Many marketers uses this concept to understand the usage situations and thus thereby, expanding the usage situations to gain major sales gain. The usage or the need can be created by various means or advertisements.

In the given case study, where the diamond distributor expand the usage situation by creating the need or use to wear the ring in right hand for women as to show self-independence.

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.

i would say b. research typically uses a variety of sources