Find the GCF for the List $14 m ^ { 4 } , 56 m ^ { 7 }$

Multiple Choice

Find the GCF for the list.
- $14 m ^ { 4 } , 56 m ^ { 7 }$

A) $14 \mathrm {~m} ^ { 3 }$
B) $14 m ^ { 4 }$
C) $784 \mathrm {~m} ^ { 3 }$
D) $56 \mathrm {~m} ^ { 4 }$