Which rover was the first to explore Mars?

Curiosity
Opportunity
Sojourner
Spirit
Sojourner was the first Mars rover. It was much smaller than Curiosity, whose wheel is about the size of the whole Sojourner. It landed on July 4, 1997 as part of the Mars Pathfinder mission on Mars's Ares Vallis and remained in contact with Earth till September 27, 1997.
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Answers by country

Curiosity
Opportunity
Sojourner
Spirit
answers
flagRepublic of Ireland
20%
0%
66%
13%
15
flagthe United States
28%
7%
53%
10%
82
flagAustralia
25%
7%
51%
14%
27
flagthe Philippines
33%
16%
41%
8%
12
flagIndia
36%
13%
38%
10%
138
flagGreece
33%
16%
33%
16%
12
flagthe United Kingdom
50%
6%
32%
10%
46
flagFrance
46%
15%
30%
7%
13
flagAustria
39%
17%
28%
14%
28
flagPakistan
42%
7%
28%
21%
14
flagPoland
35%
20%
24%
18%
4812
flagGermany
40%
16%
22%
20%
146