The digits in the tens place and units place of a two digit number are t and u respectively. lf1 is placed between them, what is the value of the three digit number so formed ?

• A.  \[100u+t+10\]
• B.                          \[100t+10+u\]
• C.                         \[10t+u+1\]
• D.                         \[100t+10u+1\]