What kind of frequency distribution graph shows the frequencies as bars, with no space between ...

What kind of frequency distribution graph shows the frequencies as bars, with no space between adjacent bars?
 
  A) a bar graph
  B) a histogram
  C) a polygon
  D) a pie chart

Question 2

Two samples, each with n = 8, produce an independent-measures t statistic of t = -2.15.Which of the following decisions is justified for a two-tailed hypothesis test?
 
  A) Reject H0 with  = .05 but fail to reject with  = .01.
  B) Reject H0 with  = .05 and reject H0 with  = .01.
  C) Fail to reject H0 with  = .05 and fail to reject with  = .01.
  D) Fail to reject H0 with  = .05 but reject H0 with  = .01.