Bunuel wrote:

Jim had an average (arithmetic mean) of 86 on four tests, each grade being an integer. Did Jim score 100 on any test?

(1) Jim scored 4 points higher on each consecutive test.

(2) Jim never scored below a 70.

Jim had an average (arithmetic mean) of 86 on four tests = 86*4 = 344 (Total Marks)

(1) Jim scored 4 points higher on each consecutive test.

Let x be first test marks next three consecutive test will be x+4, x+8, x+12

Sum = 4x+24 =344

x=>80

hence highest would be 92, which gives us NO

(2) Jim never scored below a 70

Scenario 1) Let all test be 86 which gives NO

Scenario 2) Let two test be 70, 70 and other two test will be 100 & 104

Gives us Yes

Hence A

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Resource: GMATPrep RCs With Solution