If \[\text{+ and }\!\!\times\!\!\text{ ,4 and 6}\]and\[\text{+ and }\!\!\times\!\!\text{ ,4 and 6}\] it necessarily follows that

• A.  \[4+12=16\]             
• B.  \[\text{a }\square \text{ c  }\!\!\theta\!\!\text{  b}\]
• C.  \[b\times \text{a}\square c\]   
• D.  \[b\times \text{a}\square c\]