The architect approached every building project with a single guiding principle ______ form must always follow function.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
;
- Bcheck_circle
:
- C
, which is
- D
, that
Explanation
A colon introduces an elaboration of "single guiding principle." A semicolon would also work but a colon better signals explanation; ", that" creates a fragment; ", which is" is wordier.