-- When do you need to pay the balance?

-- ______  December 31.

A. In                         B. By                C. During              D. Within

-- When do you need to pay the balance?

-- ______  December 31.

A. In                         B. By                C. During              D. Within

-- When do you need to pay the balance?

-- ______  December 31.

A. In                         B. By                C. During              D. Within

-- When do you need to pay the balance?

-- ______  December 31.

A. In                              B. By                  C. During                 D. Within

-- When do you need to pay the balance?

-- ______  December 31.