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【单选题】
{a n }是等差数列且公差d=-4．（） (1)等差数列{a n }中，a 1 =23，前6正数，从第7为负数； (2)等差数列{a n }的公差d为整数．
A.
条件（1）充分，但条件（2）不充分.
B.
条件（2）充分，但条件（1）不充分.
C.
条件（1）和（2）单独都不充分，但条件（1）和条件（2）联合起来充分.
D.
条件（1）充分，条件（2）也充分.
E.
条件（1）和（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.
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