A spontaneous endothermic reaction always a. bursts into flame.
b. causes the surroundings to get colder.
c. requires a spark to initiate it.
d. leads to a decrease in enthalpy.
e. releases heat to the surroundings.

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

the answer is a for sure mark brainliest i had got this right on usatestprep