Please help solve the following data sufficiency GMAT practice exam question and explain how you came to your conclusion (answer).

Over a seven week period, a company monitored the output of two of its sectors, C and D. Each week, the company calculated how many units were produced in each sector. The sector that produced the greatest number of units for four or more of the seven weeks was considered the more efficient sector. Which sector was deemed more efficient?

(1) Over the seven week period, sector C produced twice as many units as sector D

(2) The sector that was more efficient was known by the fifth week

(A) if statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked

(B) if statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked

(C) if BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient

(D) if EACH statement ALONE is sufficient to answer the question asked

(E) if statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked and additional data specific to the problem are needed.