Identify the correct sentence. a. someone opened the window because them was too warm. b. someone opened the window because he or she was too warm. c. someone opened the window because they were too warm. d. someone opened the window because they be too warm.

B. Someone opened the window because he or she was too warm.

The use of "he or she" is correct here because at the beginning of the sentence uses the word "someone" which is singular and the two must correspond, so the that one must be singular as well so it can't be "they" or "them"

One method of studying is to study while listening to music with headphones.

Explanation: