In the section "Investigating Life: Cutting Off a Tumor's Supply Lines in the War on Cancer," what hypothesis were the researchers testing by treating tumors with endostatin and the standard chemotherapy drug?
A) The tumors will grow larger with endostatin treatment.
B) Endostatin will have no effect on tumor growth.
C) Tumors will respond better to chemotherapy with endostatin.
D) Tumors will resist chemotherapy with endostatin.
