What did Incas first think when they saw Spaniards riding horses?

Although vastly outnumbered, the Spaniards launched a surprise attack on the Inca emperor, Atahuallpa, who was surrounded by about 80,000 Inca soldiers. The Spanish charged into the crowd on horseback, their steel weapons easily cutting through the Incas' quilted armor.

a and b because with the other three, they simplify to something else.

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.