What three things happen to plates at the plate boundaries (where two or more plates come together)?
a. at spreading ridges.
b. at convergent margins.
c. at transform faults.

Your question is not clear but if you can explain yourself i would be glad to .  just trying to : ))

Ithink it is +1hope this

Reaction involved in present system is :   c12h22o11 + h2o → 2 c6h12o6the reaction system is obeying following rate law:   rate = k[c12h22o11]thus, it is a first order reaction.now, for 1st order reactionrate constant (k) =  given: initial conc. = 3.0 g, final conc. = 2.7 g, t = 2.5 h∴rate constant (k) =  ∴ k = 0.04215 h-1now, for 1st order reaction, half life = 0.693/k = 0.693/0.04215 = 16.4 hthus correct answer is option b