Inflation rising trend

Gaurav 2013-fall wrote:Last year the rate of inflation was 1.2 percent, but for the current year it has been 4 percent. We can
conclude that inflation is on an upward trend and the rate will be still higher next year.

Which of the following, if true, most seriously weakens the conclusion above?

We need to check for options which will tell us inflation may not increase continuously!

(A) The inflation figures were computed on the basis of a representative sample of economic data rather than all of the available data. - Nope; It says the calculations are wrong (Out of scope)
(B) Last year a dip in oil prices brought inflation temporarily below its recent stable annual level of 4 percent. Perfect; Says the inflation has stabled at 4
(C) Increases in the pay of some workers are tied to the level of inflation, and at an inflation rate of 4 percent or above, these pay raises constitute a force causing further inflation. So what ?? Irrelevant
(D) The 1.2 percent rate of inflation last year represented a ten-year low. Out of scope
(E) Government intervention cannot affect the rate of inflation to any significant degree. Out of Scope

IMO: B

sachindia wrote:I dont understand why A is wrong.

If it was calculated using a representation and not the actual data, then the derivation about the inflation result is wrong. So we cannot say that inflation will increase or decrease as the previous data was wrong.

Experts please help