For each of the following, decide if the given series is a geometric series.

A. $2 + {2\over 2} + {2\over 3} + {2\over 4} + \cdots$ :
Is this a geometric series?
A. Yes
B. No

If this is a geometric series, enter
the first term:
and the ratio between successive terms:
(Enter na for the first term and ratio if this is not a geometric series.)

B. $2 + 2 x + 2 x^2 + 2 x^4 + 2 x^8 + \cdots$ :
Is this a geometric series?
A. Yes
B. No

If this is a geometric series, enter
the first term:
and the ratio between successive terms:
(Enter na for the first term and ratio if this is not a geometric series.)

C. $2 x^3 + 2 x^{4} + 2 x^{5} + 2 x^{6} + \cdots$ :
Is this a geometric series?
A. Yes
B. No

If this is a geometric series, enter
the first term:
and the ratio between successive terms:
(Enter na for the first term and ratio if this is not a geometric series.)