A. My aunt and uncle usually sends me a picture postcard when they travel.
Explanation:
The subject is <u>My aunt and uncle</u>. This phrase can be replaced with the pronoun <em>they</em> because we have two people here who send me a postcard. So the verb number needs to be changed in order to agree with the number of the subject: it should be send, not sends.
In other words, use a plural verb with two or more subjects when they are connected by <u>and</u>.
Nesbitt's store on December 22 of last year. There were three people involved in this evil plan. James King and Richard "Bobo" Evans were to enter the store. The defendant, Steve Harmon, was the lookout.