Final answer:
The fourth movement of Bach's Cantata No. 140 features tenors singing the melody in unison, uses a chorale melody by Philipp Nicolai, and includes the strings playing a countermelody.
Step-by-step explanation:
The correct statements regarding the fourth movement of Bach's Cantata No. 140 are as follows:
- The tenors sing the melody in unison.
- It uses a chorale melody by Philipp Nicolai.
- The strings play a countermelody.
Bach composed the melodic material, including the chorale melody that is sung by a four-part chorus (SATB). However, the strings do not play the chorale melody. Instead, they play a countermelody.