Google Sheets If else formula

I'm trying to write an if else statement in Google Sheets.
I want the value in cell B2 to dictate what the value you will be in cell D2. If the cell B2 is less than 12 than I want D2 = 17, if B2 is less than 15 but greater than 12 then I want it to equal to 16 and so on and so forth as shown by the code above.